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Trying to understand arrow next to PHP function


Trying to understand arrow next to PHP function

By : Kavesh Naidoo
Date : November 25 2020, 01:01 AM
wish of those help So I'm reading some documentation on Drupal, and I come across this example: , It's just a more readable way of writing:
code :


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SyntaxError: invalid arrow-function arguments (parentheses around the arrow-function may help)

SyntaxError: invalid arrow-function arguments (parentheses around the arrow-function may help)


By : José María Acuña Mor
Date : March 29 2020, 07:55 AM
I hope this helps you . Such code will generate an error: , => should be >= (more than or equal)
code :
f = x => this.y * x
f = function(x) {
    return this.y * x;
}.bind(this)
Angular2 subscribe understand arrow function

Angular2 subscribe understand arrow function


By : Cole Hinton
Date : March 29 2020, 07:55 AM
help you fix your problem JS by default executes functions in the scope of the caller. If you pass a function around to be called somewhere else, this points to the caller. In your code you pass the function to the observable via the subscribe(...) method and then the function is called by the observable when an event is to be emitted.
If you use arrow function, then this keeps pointing to the class where it is defined.
code :
    this.readdataservice.getPost().subscribe(
        function (posts) {
            this.posts = posts;
        }.bind(this)

    );
WebStorm: Converting direct-return arrow function into multi-line arrow function

WebStorm: Converting direct-return arrow function into multi-line arrow function


By : alexandre pires
Date : March 29 2020, 07:55 AM
wish of those help Put cursor on input, hit Alt+Enter, choose Add braces to arrow function statement:
code :
const cuteLittleFunction = input => {
    return value;
};
How to understand `this` inside a normal function and an arrow function?

How to understand `this` inside a normal function and an arrow function?


By : dustinodzf
Date : March 29 2020, 07:55 AM
I wish this helpful for you An arrow function does not have its own this binding, so it uses the one that it closes over.
To get it, instead define an event parameter. and use event.currentTarget.width.
code :
img.onload = event => {
  console.log('image;', event.currentTarget.width, event.currentTarget.height);
  ctx.drawImage(img, 0, 0, width, height);
};
I don't understand why a certain arrow function in JavaScript doesnt behave like a regular one

I don't understand why a certain arrow function in JavaScript doesnt behave like a regular one


By : user3541913
Date : March 29 2020, 07:55 AM
Any of those help The following code worked, and should print the sum of all args: , Arrow functions can never be named, like you do with
code :
return function sum(
const fnName = (...args) => ...
return function sum(...args){
//              ^^^
const sum=()=>sum(...args)=>args.reduce((a,b)=>a+b);
const sum = (...args) => args.reduce((a, b) => a + b);
const sum = (...args) => args.reduce((a, b) => a + b);
const s = [5, 7, 2];

console.log(sum(1, 2, 4, 9))
(function foo() {
  console.log('foo');
  setTimeout(foo, 1000);
})();
const foo = () => {
  console.log('foo');
  setTimeout(foo, 1000);
};
foo();
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