closures Questions
6
Solved
I want to use a state variable (value) when a modal is closed. However, any changes made to the state variable while the modal is open are not observed in the handler. I don't understand why it doe...
Freudian asked 13/9, 2022 at 4:0
0
I can't figure out why I need a 'static bound in one case (bar) and not the other (baz):
fn f<T>(_input: T) -> bool {
false
}
fn bar<T>() -> Box<dyn Fn(T) -> bool + 'stati...
3
How should I document an anonymous function when it's passed as an argument? For example:
// Call my_function(), passing 2 arguments.
my_function( 'foo', function() {
// Body of the anon function...
2
Solved
Basically I am going through the definition of closure functions which says -
A function that can be referenced with access to the variables in
its lexical scope is called a closure
So I want to ...
Aconcagua asked 3/3, 2020 at 8:47
6
Solved
This SpriteKit action repeats by calling itself with a completion closure. It uses a closure, rather than an SKAction.repeatActionForever(), because it needs to generate a random variable each repe...
Acroter asked 25/6, 2014 at 17:27
4
Solved
I would like to replicate the behavior and ergonomics of taking a closure/function as an argument much like map does: iterator.map(|x| ...).
I've noticed that some library code allows passing in a...
Oletta asked 17/3, 2020 at 7:12
4
Not sure if that's an issue with Swift, XCode or Alamofire but I recognized strange behavior on different places within my mixed Swift/Objc app. It only happens in parts which are written in Swift ...
Hindoo asked 26/1, 2015 at 15:23
3
Solved
Consider the following Go code (also on the Go Playground):
package main
import "fmt"
import "time"
func main() {
for _, s := range []string{"foo", "bar"}...
2
Solved
Would be possible to specify a default argument value when argument is a PHP closure? Like:
public function getCollection($filter = function($e) { return $e; })
{
// Stuff
}
Am i missing someth...
3
When providing callbacks to JavaScript using Closures, what's a better way to deal with avoiding freeing them? The wasm-bindgen guide suggests using .forget, but admits that that is essentially lea...
Forsythia asked 21/1, 2020 at 7:12
2
I've got this build.gradle file:
repositories {
maven {
credentials {
username "$artifactory_user"
password "$artifactory_password"
}
url 'http://some.domain/artifactory/repo'
}
}
publishi...
Capacitor asked 23/1, 2019 at 15:32
2
Solved
I attempt to implement a currying function similar to Functional Programming Jargon in Rust:
fn add_origin(x: i32) -> impl Fn(i32) -> i32 {
return move |y| {
x + y
};
}
fn main() {
let a...
Scot asked 22/9, 2020 at 7:31
9
Solved
I'm trying to create functions inside of a loop:
functions = []
for i in range(3):
def f():
return i
functions.append(f)
Alternatively, with lambda:
functions = []
for i in range(3):
functio...
11
Solved
I would like this to work, but it does not:
#include <stdio.h>
typedef struct closure_s {
void (*incrementer) ();
void (*emitter) ();
} closure;
closure emit(int in) {
void incrementer...
17
Solved
Could someone explain? I understand the basic concepts behind them but I often see them used interchangeably and I get confused.
And now that we're here, how do they differ from a regular functio...
Popover asked 21/10, 2008 at 3:12
7
Solved
Are there pythonic ways to maintain state (for purposes of optimisation, for example) without going fully object-oriented?
To illustrate my question better, here's an example of a pattern I use fr...
2
Solved
In this block of code below, I expect the output to be 0, 1, 2, 3,..., 9. However, only the output 10, 10,...,10 is produced.
package main
import "fmt"
func adder() []func() {
out := []func(){}...
Pleurisy asked 15/11, 2018 at 17:57
16
Solved
I am following the go tour on their official website and I have been asked to write a Fibonacci generator. Here it is:
package main
import "fmt"
// fibonacci is a function that returns
// a fu...
2
Solved
I have a code base with mixed Java and Groovy code. For iteration in the Groovy code, we tend to use closures:
String[] strings = ["First", "Second", "Third"]
strings.each { string ->
println ...
Hilarius asked 11/3, 2013 at 9:13
4
I'm trying to write a light observer class in Swift (currently Swift 2). The idea is to use it within an Entity Component system, as a means for the components to communicate with one-another witho...
Dealer asked 28/6, 2016 at 10:29
2
Solved
I tried to use Delphi's syntax for anonymous methods:
type
fun = reference to function(): Integer;
Fpc shows a syntax error:
Error: Identifier not found "reference"
What's the Free Pascal eq...
Aleron asked 17/10, 2011 at 20:19
3
Solved
Is there a way to pass a method as a parameter in Groovy without wrapping it in a closure? It seems to work with functions, but not methods. For instance, given the following:
def foo(Closure c) {...
Affectionate asked 5/3, 2013 at 18:54
4
Solved
Let's say we have an array of objects like:
var fruits = [ {name:"banana", weight:150},{name:"apple", weight:95},{name:"orange", weight:160},{name:"kiwi", weight:80} ];
I want to populate a "hea...
Footton asked 9/8, 2016 at 15:52
11
Solved
I met an interesting issue about C#. I have code like below.
List<Func<int>> actions = new List<Func<int>>();
int variable = 0;
while (variable < 5)
{
actions.Add(() =...
Roede asked 7/11, 2008 at 7:26
4
Solved
I am trying to build a control structure in a class method that takes a function as input and has different behaviors if a function is decorated or not. Any ideas on how you would go about building...
Barbour asked 29/7, 2021 at 23:40
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