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blocks | Blocks makes it easy to define blocks | Frontend Framework library

 by   hunterae Ruby Version: Current License: MIT

 by   hunterae Ruby Version: Current License: MIT

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kandi X-RAY | blocks Summary

blocks is a Ruby library typically used in User Interface, Frontend Framework, React, Ruby On Rails applications. blocks has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.
The Blocks gem is many things. Essentially, this all boils down to the following: Blocks makes it easy to define blocks of code that can be rendered either verbatim or with replacements and modifications at some later point in time.
Support
Support
Quality
Quality
Security
Security
License
License
Reuse
Reuse

kandi-support Support

  • blocks has a low active ecosystem.
  • It has 10 star(s) with 3 fork(s). There are 4 watchers for this library.
  • It had no major release in the last 12 months.
  • There are 0 open issues and 9 have been closed. On average issues are closed in 748 days. There are 1 open pull requests and 0 closed requests.
  • It has a neutral sentiment in the developer community.
  • The latest version of blocks is current.
blocks Support
Best in #Frontend Framework
Average in #Frontend Framework
blocks Support
Best in #Frontend Framework
Average in #Frontend Framework

quality kandi Quality

  • blocks has 0 bugs and 0 code smells.
blocks Quality
Best in #Frontend Framework
Average in #Frontend Framework
blocks Quality
Best in #Frontend Framework
Average in #Frontend Framework

securitySecurity

  • blocks has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
  • blocks code analysis shows 0 unresolved vulnerabilities.
  • There are 0 security hotspots that need review.
blocks Security
Best in #Frontend Framework
Average in #Frontend Framework
blocks Security
Best in #Frontend Framework
Average in #Frontend Framework

license License

  • blocks is licensed under the MIT License. This license is Permissive.
  • Permissive licenses have the least restrictions, and you can use them in most projects.
blocks License
Best in #Frontend Framework
Average in #Frontend Framework
blocks License
Best in #Frontend Framework
Average in #Frontend Framework

buildReuse

  • blocks releases are not available. You will need to build from source code and install.
  • Installation instructions, examples and code snippets are available.
  • It has 5167 lines of code, 97 functions and 102 files.
  • It has medium code complexity. Code complexity directly impacts maintainability of the code.
blocks Reuse
Best in #Frontend Framework
Average in #Frontend Framework
blocks Reuse
Best in #Frontend Framework
Average in #Frontend Framework
Top functions reviewed by kandi - BETA

kandi has reviewed blocks and discovered the below as its top functions. This is intended to give you an instant insight into blocks implemented functionality, and help decide if they suit your requirements.

  • Merges the definition with the given definition .
    • Creates a wrapping tag .
      • Renders the given hash .
        • Builds the block definition for this context .
          • Prints the description of a line .
            • Generate code for code

              Get all kandi verified functions for this library.

              Get all kandi verified functions for this library.

              blocks Key Features

              a container for reusable blocks of code and options

              a common interface for rendering code, whether the code was defined previously in Ruby blocks, Rails partials, or proxies to other blocks of code

              a series of hooks and wrappers that can be utilized to render code before, after, and around other blocks of code, as well as before each, after each, and around each item in a collection

              a templating utility for easily building reusable and highly customizable UI components

              a means for DRYing up oft-repeated code in your layouts and views

              a simple mechanism for changing or skipping the rendering behavior for particular blocks of code

              Installation

              copy iconCopydownload iconDownload
              gem 'blocks'
              

              Unexpected behaviours with Raku lambdas that are supposed to be equal (I guess)

              copy iconCopydownload iconDownload
              if 1 { 2 } else { 3 }
              
              if 1 -> { 2 } else -> { 3 }
              
              {if $^x {$^y} else {$^z}}
              
              -> $x, $y, $z {if $x {$y} else {$z}}
              
              -> $x {if $x -> $y {$y} else -> $z {$z}};
              
              {$^x ?? $^y !! $^z}
              
              if 1 { 2 } else { 3 }
              
              if 1 -> { 2 } else -> { 3 }
              
              {if $^x {$^y} else {$^z}}
              
              -> $x, $y, $z {if $x {$y} else {$z}}
              
              -> $x {if $x -> $y {$y} else -> $z {$z}};
              
              {$^x ?? $^y !! $^z}
              
              if 1 { 2 } else { 3 }
              
              if 1 -> { 2 } else -> { 3 }
              
              {if $^x {$^y} else {$^z}}
              
              -> $x, $y, $z {if $x {$y} else {$z}}
              
              -> $x {if $x -> $y {$y} else -> $z {$z}};
              
              {$^x ?? $^y !! $^z}
              
              if 1 { 2 } else { 3 }
              
              if 1 -> { 2 } else -> { 3 }
              
              {if $^x {$^y} else {$^z}}
              
              -> $x, $y, $z {if $x {$y} else {$z}}
              
              -> $x {if $x -> $y {$y} else -> $z {$z}};
              
              {$^x ?? $^y !! $^z}
              
              if 1 { 2 } else { 3 }
              
              if 1 -> { 2 } else -> { 3 }
              
              {if $^x {$^y} else {$^z}}
              
              -> $x, $y, $z {if $x {$y} else {$z}}
              
              -> $x {if $x -> $y {$y} else -> $z {$z}};
              
              {$^x ?? $^y !! $^z}
              
              if 1 { 2 } else { 3 }
              
              if 1 -> { 2 } else -> { 3 }
              
              {if $^x {$^y} else {$^z}}
              
              -> $x, $y, $z {if $x {$y} else {$z}}
              
              -> $x {if $x -> $y {$y} else -> $z {$z}};
              
              {$^x ?? $^y !! $^z}
              
              my $modToString =-> $x,$y,$z {$x%%$y??$z!!''}
              my $FB =-> $x {$modToString($x,3,'fizz')~$modToString($x,5,'buzz')}
              my $logic =-> $x {$FB($x)??$FB($x)!!$x}
              say map(-> $x {$logic($x)}, 1..100)
              

              AttributeError: Can't get attribute 'new_block' on <module 'pandas.core.internals.blocks'>

              copy iconCopydownload iconDownload
              import numpy as np 
              import pandas as pd
              df =pd.DataFrame(np.random.rand(3,6))
              
              with open("dump_from_v1.3.4.pickle", "wb") as f: 
                  pickle.dump(df, f) 
              
              quit()
              
              import pickle
              
              with open("dump_from_v1.3.4.pickle", "rb") as f: 
                  df = pickle.load(f) 
              
              
              ---------------------------------------------------------------------------
              AttributeError                            Traceback (most recent call last)
              <ipython-input-2-ff5c218eca92> in <module>
                    1 with open("dump_from_v1.3.4.pickle", "rb") as f:
              ----> 2     df = pickle.load(f)
                    3 
              
              AttributeError: Can't get attribute 'new_block' on <module 'pandas.core.internals.blocks' from '/opt/anaconda3/lib/python3.7/site-packages/pandas/core/internals/blocks.py'>
              
              import numpy as np 
              import pandas as pd
              df =pd.DataFrame(np.random.rand(3,6))
              
              with open("dump_from_v1.3.4.pickle", "wb") as f: 
                  pickle.dump(df, f) 
              
              quit()
              
              import pickle
              
              with open("dump_from_v1.3.4.pickle", "rb") as f: 
                  df = pickle.load(f) 
              
              
              ---------------------------------------------------------------------------
              AttributeError                            Traceback (most recent call last)
              <ipython-input-2-ff5c218eca92> in <module>
                    1 with open("dump_from_v1.3.4.pickle", "rb") as f:
              ----> 2     df = pickle.load(f)
                    3 
              
              AttributeError: Can't get attribute 'new_block' on <module 'pandas.core.internals.blocks' from '/opt/anaconda3/lib/python3.7/site-packages/pandas/core/internals/blocks.py'>
              

              How std::atomic wait operation works?

              copy iconCopydownload iconDownload
              
              std::mutex atomic_mutexes[64];
              std::condition_variable atomic_conds[64];
              
              template<class T>
              std::size_t index_for_atomic(std::atomic<T>* ptr) noexcept
              { return reinterpret_cast<std::size_t>(ptr) / sizeof(T) % 64; }
              
              void atomic<T>::wait(T value, std::memory_order order)
              {
                  if(this->load(order) != value)
                      return;
                  std::size_t index = index_for_atomic(this);
                  std::unique_lock<std::mutex> lock(atomic_mutexes[index]);
                  while(this->load(std::memory_order_relaxed) == value)
                      atomic_conds[index].wait(lock);
              }
              template<class T>
              void std::atomic_notify_one(std::atomic<T>* ptr)
              {
                  const std::size_t index = index_for_atomic(ptr);
                  /*
                   * normally we don't need to hold the mutex to notify
                   * but in this case we updated the value without holding
                   * the lock. Therefore without the mutex there would be
                   * a race condition in wait() between the while-loop condition
                   * and the loop body
                   */
                  std::lock_guard<std::mutex> lock(atomic_mutexes[index]);
                  /*
                   * needs to notify_all because we could have multiple waiters
                   * in multiple atomics due to aliasing
                   */
                  atomic_conds[index].notify_all();
              }
              

              Paramiko authentication fails with &quot;Agreed upon 'rsa-sha2-512' pubkey algorithm&quot; (and &quot;unsupported public key algorithm: rsa-sha2-512&quot; in sshd log)

              copy iconCopydownload iconDownload
              ssh_client.connect(
                server, username=ssh_user, key_filename=ssh_keypath,
                disabled_algorithms=dict(pubkeys=["rsa-sha2-512", "rsa-sha2-256"]))
              

              error_code&quot;:403,&quot;description&quot;:&quot;Forbidden: bot was blocked by the user. error handle in python

              copy iconCopydownload iconDownload
              @tb.message_handler(func=lambda message: True)
              def echo_message(message):
              
                  try:
                      tb.reply_to(message, message.text)
                  except Exception as e:
                      print(e)
              
              tb.polling(none_stop=True, timeout=123)
              
              from telebot.apihelper import ApiTelegramException
              
              @tb.message_handler() # "func=lambda m: True" isn't needed
              def echo_all(message):
                  time.sleep(20) # to make delay
                  try:
                         ret_msg=tb.reply_to(message, "response message")
                  except ApiTelegramException as e:
                         if e.description == "Forbidden: bot was blocked by the user":
                                 print("Attention please! The user {} has blocked the bot. I can't send anything to them".format(message.chat.id))
              
              class Exception_Handler:
                  def handle(self, e: Exception):
                      # Here you can write anything you want for every type of exceptions
                      if isinstance(e, ApiTelegramException):
                          if e.description == "Forbidden: bot was blocked by the user":
                              # whatever you want
              
              tg = TeleBot(token, exception_handler = Exception_Handler())
              @tb.message_handler()
              def echo_all(message):
                  time.sleep(20) # to make delay
                  ret_msg = tb.reply_to(message, "response message")
              
              from telebot.apihelper import ApiTelegramException
              
              @tb.message_handler() # "func=lambda m: True" isn't needed
              def echo_all(message):
                  time.sleep(20) # to make delay
                  try:
                         ret_msg=tb.reply_to(message, "response message")
                  except ApiTelegramException as e:
                         if e.description == "Forbidden: bot was blocked by the user":
                                 print("Attention please! The user {} has blocked the bot. I can't send anything to them".format(message.chat.id))
              
              class Exception_Handler:
                  def handle(self, e: Exception):
                      # Here you can write anything you want for every type of exceptions
                      if isinstance(e, ApiTelegramException):
                          if e.description == "Forbidden: bot was blocked by the user":
                              # whatever you want
              
              tg = TeleBot(token, exception_handler = Exception_Handler())
              @tb.message_handler()
              def echo_all(message):
                  time.sleep(20) # to make delay
                  ret_msg = tb.reply_to(message, "response message")
              
              from telebot.apihelper import ApiTelegramException
              
              @tb.message_handler() # "func=lambda m: True" isn't needed
              def echo_all(message):
                  time.sleep(20) # to make delay
                  try:
                         ret_msg=tb.reply_to(message, "response message")
                  except ApiTelegramException as e:
                         if e.description == "Forbidden: bot was blocked by the user":
                                 print("Attention please! The user {} has blocked the bot. I can't send anything to them".format(message.chat.id))
              
              class Exception_Handler:
                  def handle(self, e: Exception):
                      # Here you can write anything you want for every type of exceptions
                      if isinstance(e, ApiTelegramException):
                          if e.description == "Forbidden: bot was blocked by the user":
                              # whatever you want
              
              tg = TeleBot(token, exception_handler = Exception_Handler())
              @tb.message_handler()
              def echo_all(message):
                  time.sleep(20) # to make delay
                  ret_msg = tb.reply_to(message, "response message")
              
              
              def command_start(update: Update, context: CallbackContext):
                bot = context.bot
                cid = update.message.chat_id
                bot.send_message(cid, "Bot para aprender")
              
              def repeat_test(context: CallbackContext): 
                usuarios = ['1732411248','1284725300']
                job = context.job
                for usuario in usuarios:
                 context.bot.send_message(chat_id=usuario, text=job.context)
                      
              def bot_main():
                updater = Updater(BOT_TOKEN, use_context=True)
                dp = updater.dispatcher
                dp.add_handler(CommandHandler("start", command_start))
              
                job_que = updater.job_queue
              
                morning = datetime.time(2, 21, 1, 1, tzinfo=pytz.timezone("Cuba"))
                
                job_que.run_daily(repeat_test, morning25, context="sense")
                job_que.start()   
              
                updater.start_polling(timeout=30) 
                updater.idle()` 
              

              Is it possible to combine type constraints in Rust?

              copy iconCopydownload iconDownload
              trait MyConstraint: Ord + Default + Clone {}
              impl <T: Ord + Default + Clone> MyConstraint for T {}
              
              struct LeafNode<K: MyConstraint> {
                  keys: Vec<K>
              }
              
              impl<K: MyConstraint> LeafNode<K> {
                  fn keys(&self) -> &[K] {
                      &self.keys
                  }
              }
              
              #![feature(trait_alias)]
              
              trait MyConstraint = Ord + Default + Clone;
              
              struct LeafNode<K: MyConstraint> {
                  keys: Vec<K>
              }
              
              impl<K: MyConstraint> LeafNode<K> {
                  fn keys(&self) -> &[K] {
                      &self.keys
                  }
              }
              

              C++ algorithm to sum contiguous blocks of integers

              copy iconCopydownload iconDownload
              namespace rv = ranges::views;
              namespace rs = ranges;
              
              auto sum_blocks(int block_size, std::vector<int> const & input)
              {
                return input 
                       | rv::chunk(block_size) 
                       | rv::transform([](auto const & block) {
                           return rs::accumulate(block, 0);
                         }) 
                       | rs::to<std::vector<int>>;
              }
              
              // A stencil captures the src and result arrays
              // Each element of the result depends on block size elements of the source
              auto stencil = [&src, &ret, blockSz](size_t start, size_t end){
                      for (size_t i(start); i < end; ++i)
                      {
                          ret[i] = std::accumulate(
                              src.begin() + i * blockSz, 
                              src.begin() + i * blockSz + blockSz, 0);
                      }
                  };
              
              auto block_reduce(std::vector<int> src, size_t blockSz, size_t nWorkers)
              {
                  std::vector<int> ret(src.size() / blockSz, 0);
                  
                  auto stencil = [&src, &ret, blockSz](size_t start, size_t end){
                      for (size_t i(start); i < end; ++i)
                      {
                          ret[i] = std::accumulate(
                              src.begin() + i * blockSz, 
                              src.begin() + i * blockSz + blockSz, 0);
                      }
                  };
                  
                  size_t chunk = ret.size() / nWorkers;
                  size_t iStart = 0, iEnd = chunk;
                  std::vector<std::future<void>> results;
                  
                  while (iEnd < ret.size())
                  {
                      results.push_back(std::async(stencil, iStart, iEnd));
                      iStart = iEnd;
                      iEnd += chunk;
                  }
                  stencil(iStart, ret.size());
                  
                  while (!results.empty())
                  {
                      results.back().wait();
                      results.pop_back();
                  }
                  
                  return ret;
              }
              
              // A stencil captures the src and result arrays
              // Each element of the result depends on block size elements of the source
              auto stencil = [&src, &ret, blockSz](size_t start, size_t end){
                      for (size_t i(start); i < end; ++i)
                      {
                          ret[i] = std::accumulate(
                              src.begin() + i * blockSz, 
                              src.begin() + i * blockSz + blockSz, 0);
                      }
                  };
              
              auto block_reduce(std::vector<int> src, size_t blockSz, size_t nWorkers)
              {
                  std::vector<int> ret(src.size() / blockSz, 0);
                  
                  auto stencil = [&src, &ret, blockSz](size_t start, size_t end){
                      for (size_t i(start); i < end; ++i)
                      {
                          ret[i] = std::accumulate(
                              src.begin() + i * blockSz, 
                              src.begin() + i * blockSz + blockSz, 0);
                      }
                  };
                  
                  size_t chunk = ret.size() / nWorkers;
                  size_t iStart = 0, iEnd = chunk;
                  std::vector<std::future<void>> results;
                  
                  while (iEnd < ret.size())
                  {
                      results.push_back(std::async(stencil, iStart, iEnd));
                      iStart = iEnd;
                      iEnd += chunk;
                  }
                  stencil(iStart, ret.size());
                  
                  while (!results.empty())
                  {
                      results.back().wait();
                      results.pop_back();
                  }
                  
                  return ret;
              }
              
              std::vector<int> sum_blocks(int block_size, const std::vector<int> &input){
                  std::vector<int> result(input.size() / block_size, 0);
                  for(int i = 0; i < result.size(); i++){
                      result[i] = std::accumulate(input.begin() + i*block_size, input.begin() + (i+1)*block_size, 0);
                  }
                  return result;
              }
              
              std::vector<int> sum_blocks(int block_size, const std::vector<int> &input){
                  std::vector<int> result(input.size() / block_size, 0);
                  auto it1 = result.begin();
                  auto it2 = input.begin();
                  while(it1 != result.end()){
                      *it1 = std::accumulate(it2, it2 + block_size, 0);
                      std::advance(it1, 1);  // same as it1++;
                      std::advance(it2, block_size); // same as it2 += block_size;
                  }
                  return result;
              }
              
              std::vector<int> sum_blocks(int block_size, const std::vector<int> &input){
                  std::vector<int> result(input.size() / block_size, 0);
                  for(int i = 0; i < result.size(); i++){
                      result[i] = std::accumulate(input.begin() + i*block_size, input.begin() + (i+1)*block_size, 0);
                  }
                  return result;
              }
              
              std::vector<int> sum_blocks(int block_size, const std::vector<int> &input){
                  std::vector<int> result(input.size() / block_size, 0);
                  auto it1 = result.begin();
                  auto it2 = input.begin();
                  while(it1 != result.end()){
                      *it1 = std::accumulate(it2, it2 + block_size, 0);
                      std::advance(it1, 1);  // same as it1++;
                      std::advance(it2, block_size); // same as it2 += block_size;
                  }
                  return result;
              }
              

              How to preserve trailing spaces in java 15 text blocks

              copy iconCopydownload iconDownload
              var text = """
                  blah blah    \s       
                  blah         \s
                  """;
              
              String colors = """
                 red  \s
                 green\s
                 blue \s
                 """;
              
              var text = """
                  blah blah    \s       
                  blah         \s
                  """;
              
              String colors = """
                 red  \s
                 green\s
                 blue \s
                 """;
              

              How can I have a synchronous facade over asyncpg APIs with Python asyncio?

              copy iconCopydownload iconDownload
              import asyncio
              import threading
              from datetime import datetime
              
              def main():
                  def thr(loop):
                      asyncio.set_event_loop(loop)
                      loop.run_forever()
                  
                  loop = asyncio.new_event_loop()
                  t = threading.Thread(target=thr, args=(loop, ), daemon=True)
                  t.start()
              
                  print("Hello", datetime.now())
                  t1 = asyncio.run_coroutine_threadsafe(f1(1.0), loop).result()
                  t2 = asyncio.run_coroutine_threadsafe(f1(2.0), loop).result()
                  print(t1, t2)
               
              
              if __name__ == "__main__":
                  main()
              
              >>> Hello 2021-10-26 20:37:00.454577
              >>> Hello 1.0 2021-10-26 20:37:01.464127
              >>> Hello 2.0 2021-10-26 20:37:03.468691
              >>> 1.0 2.0
              

              Changing the target of a `whenever` block from the inside

              copy iconCopydownload iconDownload
              my $x = (1,2,3);
              for $x<> {
                  .say;
                  $x = (4,5,6);
              }
              
              1
              2
              3
              
              my $c1 = Supplier.new;
              my $c2 = Supplier.new;
              
              my $s = supply {
                  whenever $c1 {
                      say "got: $_";
                      if .starts-with('3') {
                          say "listening to something new";
                          # Tap the next Supply...
                          whenever $c2 {
                              say "got: $_";
                          }
                          # ...and close the tap on the current one.
                          last;
                      }
                  }
              }
              
              $s.tap;
              
              for ^7 {
                  $c1.emit: "$_ from \$c1";
                  $c2.emit: "$_ from \$c2";
              }
              
              got: 0 from $c1
              got: 1 from $c1
              got: 2 from $c1
              got: 3 from $c1
              listening to something new
              got: 3 from $c2
              got: 4 from $c2
              got: 5 from $c2
              got: 6 from $c2
              
              method migrate(Supply:D:) {
                  supply {
                      # The Tap of the Supply we are currently emitting values from
                      my $current;
                      # Tap the Supply of Supply that we'll migrate between
                      whenever self -> \inner {
                          # Make sure we produce a sensible error
                          X::Supply::Migrate::Needs.new.throw
                              unless inner ~~ Supply;
                          # Close the tap on whatever we are currently tapping
                          $current.close if $current;
                          # Tap the new thing and store the Tap handle
                          $current = do whenever inner -> \value {
                              emit(value);
                          }
                      }
                  }
              }
              
              my $x = (1,2,3);
              for $x<> {
                  .say;
                  $x = (4,5,6);
              }
              
              1
              2
              3
              
              my $c1 = Supplier.new;
              my $c2 = Supplier.new;
              
              my $s = supply {
                  whenever $c1 {
                      say "got: $_";
                      if .starts-with('3') {
                          say "listening to something new";
                          # Tap the next Supply...
                          whenever $c2 {
                              say "got: $_";
                          }
                          # ...and close the tap on the current one.
                          last;
                      }
                  }
              }
              
              $s.tap;
              
              for ^7 {
                  $c1.emit: "$_ from \$c1";
                  $c2.emit: "$_ from \$c2";
              }
              
              got: 0 from $c1
              got: 1 from $c1
              got: 2 from $c1
              got: 3 from $c1
              listening to something new
              got: 3 from $c2
              got: 4 from $c2
              got: 5 from $c2
              got: 6 from $c2
              
              method migrate(Supply:D:) {
                  supply {
                      # The Tap of the Supply we are currently emitting values from
                      my $current;
                      # Tap the Supply of Supply that we'll migrate between
                      whenever self -> \inner {
                          # Make sure we produce a sensible error
                          X::Supply::Migrate::Needs.new.throw
                              unless inner ~~ Supply;
                          # Close the tap on whatever we are currently tapping
                          $current.close if $current;
                          # Tap the new thing and store the Tap handle
                          $current = do whenever inner -> \value {
                              emit(value);
                          }
                      }
                  }
              }
              
              my $x = (1,2,3);
              for $x<> {
                  .say;
                  $x = (4,5,6);
              }
              
              1
              2
              3
              
              my $c1 = Supplier.new;
              my $c2 = Supplier.new;
              
              my $s = supply {
                  whenever $c1 {
                      say "got: $_";
                      if .starts-with('3') {
                          say "listening to something new";
                          # Tap the next Supply...
                          whenever $c2 {
                              say "got: $_";
                          }
                          # ...and close the tap on the current one.
                          last;
                      }
                  }
              }
              
              $s.tap;
              
              for ^7 {
                  $c1.emit: "$_ from \$c1";
                  $c2.emit: "$_ from \$c2";
              }
              
              got: 0 from $c1
              got: 1 from $c1
              got: 2 from $c1
              got: 3 from $c1
              listening to something new
              got: 3 from $c2
              got: 4 from $c2
              got: 5 from $c2
              got: 6 from $c2
              
              method migrate(Supply:D:) {
                  supply {
                      # The Tap of the Supply we are currently emitting values from
                      my $current;
                      # Tap the Supply of Supply that we'll migrate between
                      whenever self -> \inner {
                          # Make sure we produce a sensible error
                          X::Supply::Migrate::Needs.new.throw
                              unless inner ~~ Supply;
                          # Close the tap on whatever we are currently tapping
                          $current.close if $current;
                          # Tap the new thing and store the Tap handle
                          $current = do whenever inner -> \value {
                              emit(value);
                          }
                      }
                  }
              }
              
              my $x = (1,2,3);
              for $x<> {
                  .say;
                  $x = (4,5,6);
              }
              
              1
              2
              3
              
              my $c1 = Supplier.new;
              my $c2 = Supplier.new;
              
              my $s = supply {
                  whenever $c1 {
                      say "got: $_";
                      if .starts-with('3') {
                          say "listening to something new";
                          # Tap the next Supply...
                          whenever $c2 {
                              say "got: $_";
                          }
                          # ...and close the tap on the current one.
                          last;
                      }
                  }
              }
              
              $s.tap;
              
              for ^7 {
                  $c1.emit: "$_ from \$c1";
                  $c2.emit: "$_ from \$c2";
              }
              
              got: 0 from $c1
              got: 1 from $c1
              got: 2 from $c1
              got: 3 from $c1
              listening to something new
              got: 3 from $c2
              got: 4 from $c2
              got: 5 from $c2
              got: 6 from $c2
              
              method migrate(Supply:D:) {
                  supply {
                      # The Tap of the Supply we are currently emitting values from
                      my $current;
                      # Tap the Supply of Supply that we'll migrate between
                      whenever self -> \inner {
                          # Make sure we produce a sensible error
                          X::Supply::Migrate::Needs.new.throw
                              unless inner ~~ Supply;
                          # Close the tap on whatever we are currently tapping
                          $current.close if $current;
                          # Tap the new thing and store the Tap handle
                          $current = do whenever inner -> \value {
                              emit(value);
                          }
                      }
                  }
              }
              
              my $x = (1,2,3);
              for $x<> {
                  .say;
                  $x = (4,5,6);
              }
              
              1
              2
              3
              
              my $c1 = Supplier.new;
              my $c2 = Supplier.new;
              
              my $s = supply {
                  whenever $c1 {
                      say "got: $_";
                      if .starts-with('3') {
                          say "listening to something new";
                          # Tap the next Supply...
                          whenever $c2 {
                              say "got: $_";
                          }
                          # ...and close the tap on the current one.
                          last;
                      }
                  }
              }
              
              $s.tap;
              
              for ^7 {
                  $c1.emit: "$_ from \$c1";
                  $c2.emit: "$_ from \$c2";
              }
              
              got: 0 from $c1
              got: 1 from $c1
              got: 2 from $c1
              got: 3 from $c1
              listening to something new
              got: 3 from $c2
              got: 4 from $c2
              got: 5 from $c2
              got: 6 from $c2
              
              method migrate(Supply:D:) {
                  supply {
                      # The Tap of the Supply we are currently emitting values from
                      my $current;
                      # Tap the Supply of Supply that we'll migrate between
                      whenever self -> \inner {
                          # Make sure we produce a sensible error
                          X::Supply::Migrate::Needs.new.throw
                              unless inner ~~ Supply;
                          # Close the tap on whatever we are currently tapping
                          $current.close if $current;
                          # Tap the new thing and store the Tap handle
                          $current = do whenever inner -> \value {
                              emit(value);
                          }
                      }
                  }
              }
              

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              QUESTION

              Unexpected behaviours with Raku lambdas that are supposed to be equal (I guess)

              Asked 2022-Apr-04 at 18:53

              I'm learning Raku as a passion project and I wanted to implement a simple fizzbuzz, why is join only retaining buzz if I write lambdas with pointy blocks?

              my $iif =-> $x,$y,$z {if $x {$y} else {$z}}
              my $modToString =-> $x,$y,$z {$iif($x%%$y,$z,'')}
              my $FB =-> $x {join($modToString($x,3,'fizz'),$modToString($x,5,'buzz'))}
              my $logic =-> $x {$iif($FB($x),$FB($x),$x)}
              say map(-> $x {$logic($x)}, 1..100)
              
              $modToString(1,3,'fizz')
              > 
              $modToString(3,3,'fizz')
              > fizz
              $modToString(3,5,'buzz')
              > 
              $modToString(5,5,'buzz')
              > buzz
              

              If I transform the pointy blocks variables into placeholder variables, Rakudo throws an error:

              my $iif = {if $^x {$^y} else {$^z}};
              my $modToString = {$iif($^x%%$^y,$^z,'')};
              my $FB = {join($modToString($^x,3,'fizz'),$modToString($^x,5,'buzz'))}
              my $logic = {$iif($FB($^x),$FB($^x),$^x)}
              say map(-> $x {$logic($x)}, 1..100)
              
              Too many positionals passed; expected 1 argument but got 3
                in block  at <unknown file> line 1
                in block  at <unknown file> line 1
                in block  at <unknown file> line 1
                in block  at <unknown file> line 1
                in block <unit> at <unknown file> line 1
              

              If I put the brackets around the join arguments it just outputs the numbers:

              my $iif =-> $x,$y,$z {if $x {$y} else {$z}}
              my $modToString =-> $x,$y,$z {$iif($x%%$y,$z,'')}
              my $FB =-> $x {join(<$modToString($x,3,'fizz'),$modToString($x,5,'buzz')>)}
              my $logic =-> $x {$iif($FB($x),$FB($x),$x)}
              say map(-> $x {$logic($x)}, 1..100)
              

              Why?

              ANSWER

              Answered 2022-Mar-27 at 22:27

              Because lots of things in Raku are blocks, even things that don't look like it. In particular, this includes the "argument" to control flow like if.

              if 1 { 2 } else { 3 }
              

              We've actually written two blocks here. One is a constant function returning 2 and the other is a constant function returning 3. Now, usually, this is transparent to us and the Raku engine is smart enough to compile those away. But they're still there. In fact, we can make them explicit. The following behaves identically to the above if statement.

              if 1 -> { 2 } else -> { 3 }
              

              In your case, however, it ends up mattering. Anonymous arguments (the ones with the ^ twigil) bind to the innermost block. So you've written

              {if $^x {$^y} else {$^z}}
              

              and you intended that it be equivalent to

              -> $x, $y, $z {if $x {$y} else {$z}}
              

              but what you actually wrote was

              -> $x {if $x -> $y {$y} else -> $z {$z}};
              

              So you've really written a function of one argument and passed it three arguments, as the error message states.

              As a broad rule, you can generally assume that anytime you see a {, it either begins a hash literal or a block. And the latter always introduces a scope in which local variables and arguments can exist.

              In your particular case, you can use the ternary ??!! operator (this is the same thing as ?: in most other languages like C++ or Java)

              {$^x ?? $^y !! $^z}
              

              This operator doesn't short-circuit and doesn't introduce blocks, so it'll work fine.

              Source https://stackoverflow.com/questions/71640655

              Community Discussions, Code Snippets contain sources that include Stack Exchange Network

              Vulnerabilities

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