Primitive | extremely basic dash made more as a poc | Frontend Framework library
kandi X-RAY | Primitive Summary
kandi X-RAY | Primitive Summary
Primitive is an extremely basic dash made more as a poc rather than anything else. You must install as an app rather than a game. Writing the app launching code - 30 mins. Creating the UI - 7 hours.
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QUESTION
How can I specify a format string for a boolean that's consistent with the other format strings for other types?
Given the following code:
...ANSWER
Answered 2022-Feb-23 at 23:46Unfortunately, no, there isn't.
According to Microsoft, the only data types with format strings are:
- Date and time types (
DateTime, DateTimeOffset) - Enumeration types (all types derived from
System.Enum) - Numeric types (
BigInteger, Byte, Decimal, Double, Int16, Int32, Int64, SByte, Single, UInt16, UInt32, UInt64) GuidTimeSpan
Boolean.ToString() can only return "True" or "False". It even says, if you need to write it to XML, you need to manually perform ToLowerCase() (from the lack of string formatting).
QUESTION
The MDN documentation on Object.prototype.toString says that when toString gets overriden, it should only return a primitive value:
The
toString()function you create must return a primitive, otherwise it will be ignored.
However, in the following example we return an object inside of toString and it returns the object normally:
ANSWER
Answered 2022-Feb-21 at 11:06You’re right, the documentation was misleading and incomplete. I have submitted a pull request that rewords it as follows:
Removed this part:
The
toString()function you create must return a primitive, otherwise it will be ignored.
Replaced by:
The
toString()function you create must return a primitive. If it returns an object and the method is called implicitly (i.e. during type conversion or coercion), then its result will be ignored and the value of a related method,valueOf(), will be used instead, or aTypeErrorwill be thrown if none of these methods return a primitive.
I have found the original pull request and commit that added this wording. There is a review comment by the author in reference to this sentence which says:
See step 5.B.ii from https://262.ecma-international.org/9.0/#sec-ordinarytoprimitive
What the author was referring to is the consequence of the OrdinaryToPrimitive abstract operation in the specification: leaving Symbol.toPrimitive aside, when a value is coerced to a primitive, the two methods toString and valueOf (the methodNames) are prepared to be called in a specific order based on a type hint.
And then:
- For each element name of methodNames, do
- Let method be ? Get(O, name).
- If IsCallable(method) is true, then
This step is a loop, iterating over the list of methodNames. It takes the next method from this list, checks if it is a function, calls it, and stores its result in result. Then it performs the type check. If the result is a primitive, i.e. not an object, this result is returned. Otherwise, the loop continues, effectively ignoring the result.
If the loop reaches the end without returning a value, a TypeError will be thrown.
In order to demonstrate this behavior, you have to have both methods:
QUESTION
C++23 std::optional is finally getting some very useful additions.
Since my knowledge of FP is very primitive I am wondering what is the syntax for the following two operations(that according to my googling are 2 basic monadic operations):
- monadic bind
- monadic return
My best guesses are:
monadic bind is transform
monadic return is just C++17 std::optional constructor(8)
ANSWER
Answered 2022-Jan-06 at 16:58Not quite.
In Haskell syntax, bind is of the form m a -> (a -> m b) -> m b, which corresponds to satisfying this concept (for all A, B, F)
QUESTION
def pythag_triples(n):
i = 0
start = time.time()
for x in range(1, int(sqrt(n) + sqrt(n)) + 1, 2):
for m in range(x+2,int(sqrt(n) + sqrt(n)) + 1, 2):
if gcd(x, m) == 1:
# q = x*m
# l = (m**2 - x**2)/2
c = (m**2 + x**2)/2
# trips.append((q,l,c))
if c < n:
i += 1
end = time.time()
return i, end-start
print(pythag_triples(3141592653589793))
ANSWER
Answered 2022-Jan-11 at 17:01Instead of the double loop over x and m and repeatedly checking if they are co-prime, we iterate only over m (the larger of the two), and apply either Euler's totient function or a custom version of it to directly count the number of x values that are relatively prime to m. This gives us a much faster method (the speed remains to be quantified more precisely): for example 43ms for n = 100_000_000 instead of 30s with the OP's code (700x speedup).
The need for a custom version arises when the maximum value xmax that x is allowed to take is smaller than m (to satisfy the inequality (m**2 + x**2)/2 <= n). In that case, not all co-primes of m should be counted but only those up to that bound.
QUESTION
In a piece of code I'm writing, I receive packets as uint8_t * and std::size_t combination. I can register functions to call with these two parameters, based on which file descriptor the packet was received from. I use an std::map > handlers to keep track of which function to call.
I would like to be able to (indirectly) register functions with arbitrary arguments. I already have a function like this to transform from the uint8_t * and std::size_t to separate variables:
ANSWER
Answered 2022-Jan-08 at 17:53It's possible, just annoying to write.
First you need a trait to get parameters from a function type:
QUESTION
This only applies to Visual Studio 2022. I had uninstalled VS2019 and Preview where F# worked absolutely fine (F# 5.0). I am using VS2022 to use F# 6.0 and do not want to go back to F# 5.0.
The issue is specific to F#. I also use C# and I have no issues running the latest C# under VS2022.
There are near continual DevEnv processes running consuming anywhere from 1 to 4 of my CPU's 4 Hyperthreads. I have switched off all experimental options I can find in F# settings.
Sometimes there are 2 or more background processes running , sometimes paused and sometimes none - there appears to be no correlation between this and the background CPU consumption
Sometimes I have a pop up Dialog about waiting to complete an editor process or a compile process.
When devenev.exe is consuming CPU cycles under the properties I see there is always one clr.dllCoUnInitializeEE+0x6790 that is the culprit. I though this was meant to be a short-lived process? Sometimes there are two or three of these consuming most of a HyperThread (There are identical others but with very low or no CPU consumption). The stack on the guilty thread is as follows:
ANSWER
Answered 2021-Dec-17 at 08:49Please report to Microsoft either using the people app in windows or the visual studio installer.
for now, there is only one option: use visual studio 2019. or try finding alternatives. there should be somewhere around the net
I suggest using Rider IDE instead(until the devs fix the bug):Download Rider IDE
I'm not really trying to advertise here, just suggesting an IDE Too compile and run you rprogram.
QUESTION
I'm just playing around with ReactJS and trying to figure out some strange behavior with the useState hook.
A component should not re-rendered if the state is set with the same primitive value (Boolean) as it was before
...ANSWER
Answered 2021-Dec-31 at 20:18If you try simple code that on click handler setState and if you click two times and in each update state with same value the component again re-render. As react doc says:
If you update a State Hook to the same value as the current state, React will bail out without rendering the children or firing effects. (React uses the Object.is comparison algorithm.)
Note that React may still need to render that specific component again before bailing out. That shouldn’t be a concern because React won’t unnecessarily go “deeper” into the tree. If you’re doing expensive calculations while rendering, you can optimize them with useMemo.
I hope the answers from this post and this github discussion help you to understand why this happens
and there are another related topics like this post and this one
QUESTION
I'm python user learning R.
Frequently, I need to check if columns of a dataframe contain NaN(s).
In python, I can simply do
...ANSWER
Answered 2021-Dec-31 at 11:42The easiest way would be:
QUESTION
I am trying to encode a small lambda calculus with algebraic datatypes in Scheme. I want it to use lazy evaluation, for which I tried to use the primitives delay and force. However, this has a large negative impact on the performance of evaluation: the execution time on a small test case goes up by a factor of 20x.
While I did not expect laziness to speed up this particular test case, I did not expect a huge slowdown either. My question is thus: What is causing this huge overhead with lazy evaluation, and how can I avoid this problem while still getting lazy evaluation? I would already be happy to get within 2x the execution time of the strict version, but faster is of course always better.
Below are the strict and lazy versions of the test case I used. The test deals with natural numbers in unary notation: it constructs a sequence of 2^24 sucs followed by a zero and then destructs the result again. The lazy version was constructed from the strict version by adding delay and force in appropriate places, and adding let-bindings to avoid forcing an argument more than once. (I also tried a version where zero and suc were strict but other functions were lazy, but this was even slower than the fully lazy version so I omitted it here.)
I compiled both programs using compile-file in Chez Scheme 9.5 and executed the resulting .so files with petite --program. Execution time (user only) for the strict version was 0.578s, while the lazy version takes 11,891s, which is almost exactly 20x slower.
ANSWER
Answered 2021-Dec-28 at 16:24This sounds very like a problem that crops up in Haskell from time to time. The problem is one of garbage collection.
There are two ways that this can go. Firstly, the lazy list can be consumed as it is used, so that the amount of memory consumed is limited. Or, secondly, the lazy list can be evaluated in a way that it remains in memory all of the time, with one end of the list pinned in place because it is still being used - the garbage collector objects to this and spends a lot of time trying to deal with this situation.
Haskell can be as fast as C, but requires the calculation to be strict for this to be possible.
I don't entirely understand the code, but it appears to be recursively creating a longer and longer list, which is then evaluated. Do you have the tools to measure the amount of memory that the garbage collector is having to deal with, and how much time the garbage collector runs for?
QUESTION
I'm asking this question because I've noticed that TypeScript allows declaring constructors that return primitive types, e.g.:
...ANSWER
Answered 2021-Dec-07 at 08:20Can a constructor ever return a primitive?
The ECMAScript specification defines a constructor as:
...an object that supports the [[Construct]] internal method.
Although exotic objects have some liberty in implementing internal methods, the specification states at 6.1.7.3 Invariants of the Essential Internal Methods:
The Internal Methods of Objects of an ECMAScript engine must conform to the list of invariants specified below. Ordinary ECMAScript Objects as well as all standard exotic objects in this specification maintain these invariants. ECMAScript Proxy objects maintain these invariants by means of runtime checks on the result of traps invoked on the [[ProxyHandler]] object.
Any implementation provided exotic objects must also maintain these invariants for those objects. Violation of these invariants may cause ECMAScript code to have unpredictable behaviour and create security issues. However, violation of these invariants must never compromise the memory safety of an implementation.
An implementation must not allow these invariants to be circumvented in any manner such as by providing alternative interfaces that implement the functionality of the essential internal methods without enforcing their invariants.
[...]
The value returned by any internal method must be a Completion Record with either:
- [[Type]] =
normal, [[Target]] =empty, and [[Value]] = a value of the "normal return type" shown below for that internal method, or- [[Type]] =
throw, [[Target]] =empty, and [[Value]] = any ECMAScript language value.[...]
[[Construct]] ( )
- The normal return type is Object.
[...]
So in conclusion, a compliant ECMAScript implementation does not allow the return value of the [[Construct]] internal method to be a primitive.
Take note that "normal return type" has a specific meaning here, which is also introduced in the quote above. "Normal" here refers to the case where no error was thrown.
You also phrased your question like this:
This made me wonder if JavaScript actually permits creating a function that returns a primitive value when invoked with new semantics
At 13.3.5 The new Operator, the specification stipulates that the Construct procedure is executed (if all checks pass):
- Return ? Construct(constructor, argList).
And the procedure at 7.3.15 Construct ( F [ , argumentsList [ , newTarget ] ] ) in turn specifies:
- Return ? F.[[Construct]](argumentsList, newTarget).
So the new operator will lead to the execution of the [[Construct]] internal method, and so the above applies.
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