Cookbook | Code snippets for various programming languages
kandi X-RAY | Cookbook Summary
kandi X-RAY | Cookbook Summary
A cookbook in the programming context is collection of tiny programs that each demonstrate a particular programming concept. The Cookbook Method is the process of learning a programming language by building up a repository of small programs that implement specific programming concepts. Starting with a Hello World program and building the knowledge piece by piece on top of that. If you are a beginner, you will probably want to start out with one language like Python and start building up your repetoire of snippets for reference and confidence. If you are a seasoned developer, you may want to start building a cookbook from scratch for a new language you have never used, or keep a cookbook for more advanced topics in a language you are already familiar with. Here is an example of when my Cookbook comes in handy. Recently I was faced with a situation where I needed to make an HTTP request to an API, parse the JSON response, generate a CSV spreadsheet, and email the spreadsheet. Because I already had my own cookbook snippets for doing each of those three actions, it was really easy to put together a program that did what I needed it to.
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QUESTION
I searched a lot about "what are benefits of using named route to navigate between screens". And I can't find any actual benefits, actually it has many disadvantages and annoying.
1. In flutter document, it said that named routes use to avoid code duplication.
For example, if I want to navigate to SecondRoute with String one argument, it change from this
...ANSWER
Answered 2022-Mar-12 at 01:20From my point of view, personally I think the root cause of your concern is you keep using pass the data around your screens using constructor or injection.
Reference from Official flutter docs: https://docs.flutter.dev/development/data-and-backend/state-mgmt/declarative
I am an iOS developer with UI kit so I think you has the same problem with me, that I resolved by changing my thinking flow.
Important thing : From the declaratively UI picture: UI = f(state).
For your problem (1):
- I think we should not to pass the data around screens, you can use rxdart, provider, mobx, redux... or any state management. It will keep the data of for UI rendering and you no need to check it again in very long switch/if in main file. If you keep passing arguments so you can't build UI from state
For your problem (2):
- I think it's the same problem with (1). Instead of using many constructors, you can create your state to reflecting it. So your screen(I mean the Widget reflecting your screen, not their sub widgets) can take data from state and no need to get it from arguments. Again, it about UI = f(state).
For your problem (3):
- I definitely agree with you, keep it in another folder is a best choice.
Note: Personally right now I split widgets to 2 types: screen and Presentational widget.
- Screen: Never pass arguments to it, it use the data from state(UI = f(state))
- Presentational widget: can receive arguments in constructor.
The original idea is from the founder of redux (https://medium.com/@dan_abramov/smart-and-dumb-components-7ca2f9a7c7d0)
=> With this idea, It clearly resolved your problem (1) and (2). With (3) by split to another folder and import it should end with some lines in main file like this(without any process arguments on screen changing):
For the benefit:
Personally I think most advantage is:
1 - You can change the screen later without modify working code(open-closed principle): Assuming your client want to change the screen A to screen A', which has alot of navigate in your code.
Example: your app can go to login screen from 3 different logic: from splash, from press logout, from admin banned message.
If you use: MaterialPageRoute(builder: (context) => SecondRoute('Some text')), so you need to replace it many times(3 times in example) inside the code that work perfectly. The most dangerous thing is: maybe the logic "from admin banned message" is @ @ from other dev
If you usse: Navigator.pushNamed(context, SecondRoute.routeName, arguments: 'Some text'), you change the code in splited folder(that you mention in (3)) by redirect it to another screen(the new login scrren)
Things below I think it less important:
2- (just a note) If you build your project with web version, you will the route name in the url address, so it turn your page to get url.
3- Prevents alot of unnecessary import(example you can see in login, if you use routes, just import 1 file. but you use navigator directly you need to import many screens related: register, forgotpass....). Anyway, it can resolve by create something like screen_index.dart.
QUESTION
I want to release a source generator package, and I want to include a private project dependency on the source generator project.
For example, assume that my projects are A.SourceGenerator
and A.CodeAnalysis.Core
. I want A.SourceGenerator
to depend on A.CodeAnalysis.Core
, but use ProjectReference
instead of PackageReference
.
This means that I want the following line or something similar in my A.SourceGenerator.csproj
file:
ANSWER
Answered 2022-Mar-08 at 15:23I don't have much knowledge about project files, but at least i can share some contents of my project file.
I had to reference other projects like this:
QUESTION
In the Programming Language Examples Alike Cookbook's chapter on Sockets, the "Pre-Forking Servers" section uses a SIGCHLD handler like this:
...ANSWER
Answered 2022-Feb-16 at 19:08Here's the version that I am using for many years. This function is set as the Sys.sigchld
handler with Sys.set_signal Sys.sigchld (Sys.Signal_handle reap)
.
QUESTION
I'm building a mutex primitive using gcc inline assembly for a CortexM7 target using the LDREX and STREX instructions, following the Barrier Litmus Tests and Cookbook document from ARM.
Code ...ANSWER
Answered 2022-Feb-15 at 11:20Per @jester's help, I realized I had the wrong constraint on the GCC-inline variable alias for the lock. It should have been "+m", specifying a memory address instead of a register.
I was also de-referencing the address of the lock when I should have been leaving it as a pointer.
I changed [lock] "+l"(*lock)
to [lock] "+m"(lock)
and it now builds.
QUESTION
I have this simple code from Perl Cookbook which prints all directories and files recursively:
...ANSWER
Answered 2021-Aug-11 at 14:40No, the -d
is a stand alone statement, it tests $_
. So it is in essence identical to
QUESTION
In ggplot2 , I want to plot boxplot+dotplot side by side as attached image. But the code can't work, anyone can help? this code from 'R graphic cookbook'. Thanks!
...ANSWER
Answered 2022-Jan-19 at 16:39This is a very interesting question. OP is looking to dodge geoms along the x axis, which is not typically difficult to do. The difficulty here lies in that you are dodging the same data using different geoms.
What you can do is use a bit of clever formatting, mapping, and faceting to recreate an example of the type of plot OP shows. For this example solution, I am using the built-in dataset, iris
. In the future, OP, please be sure to provide a reproducible example using a built-in dataset, your data, or a sample of your data.
Here's the basic plot showing a dotplot on top of a box plot below - I'll be trying to split the boxplot on the right and dotplot on the left.
QUESTION
With MYSQL, I can calculate the time difference and get it as a concatenated output. I am using queries sourced from here.
...ANSWER
Answered 2021-Dec-28 at 08:51DEMO.
QUESTION
While using Flutters http
request library I was wondering if there was an easy way to check if a request was successful without having to check the status code.
Most code samples I saw (including official ones) do something like this:
...ANSWER
Answered 2021-Dec-08 at 23:07You can make an extension method that does this easily:
QUESTION
I am making a book via bookdown
.
I know it is possible to omit headings from the Table of Contents by adding the attributes {.unlisted .unnumbered}
, as shown in Section 4.18 of the R Markdown Cookbook.
However, how can I add arbitrary content to the Table of Contents?
If I only needed to add this for the PDF output, I could use (e.g.) the LaTeX command \addcontentsline
, but I need this to show in the HTML contents sidebar as well.
For example, if you set up a new default bookdown
project from RStudio, it includes the file 01-intro.Rmd
.
The first few lines are
ANSWER
Answered 2021-Dec-05 at 23:10Maybe this solution?
CSS-file:
QUESTION
From https://docs.flutter.dev/cookbook/navigation/navigate-with-arguments it appears the preferred way of getting the arguments from a route
is using:
ANSWER
Answered 2021-Nov-24 at 10:34You can call it only once per widget initialisation by moving it to your initState()
and scheduling a post frame so it only accesses BuildContext
after rendering.
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