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Access array from other function [closed]

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Hello i'm trying to access an array from a function what i'am returning work, it's an array but the result in my function "onChangeClient" always display the same "undefined". why ?
Typescript:

JavaScript (and hence TypeScript) uses lexical scope, meaning you cannot create an Array in an inner function and access it from outside. What you can do: Create the array in the outer function (getRessource) and return it from there.
async getRessource(id) {
var ref = ... elided ...
const returnArray = []; // define it here
await ref.once('value' ... elided ... );
return returnArray;
}

What is the difference between these ways when creating a function [closed]

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When creating functions, What is the main difference and when to use these ways of creating a function?
onSubmit = () => {}
functionsName : () => {}

There's no difference in the creation of the functions, just what is done with the function once it's created:
Your onSubmit one creates a function and assigns it to an in-scope variable.
Your functionsName one creates a function and assigns it to an object property. This form is only valid within an object initializer. (Outside of an object initializer, it's not a syntax error, but it's just a labelled statement and the function is never assigned to anything.)
You may find another answer of mine useful as well. It's a rundown of various ways of creating functions.

Calling JavaScript function with the syntax (0, myFunction)() [closed]

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I'm very new in the JavaScript, but I found the syntax (0, myFunction)() to call anonymous functions on JavaScript, but I don't know what means the 0 before the anonymous function, also I don't know if instead of 0 I can use 1 or 2, etc.
Basically my question is what is the difference between call a function myFuntion() or (0, myFunction)(). The function is in a global context.
Here is an example.
var object = {}
object.foo = function(){}
The difference between call the function
(0,object.foo)();
or
object.foo();

You can rewrite both calls into the following equivalents:
object.foo.call(null); // (0,object.foo)();
object.foo.call(foo); // object.foo();
As you can see, the only difference is the "binding" of this inside the called function; but the use of (0, something)(); is considered as cryptic and should be avoided in a professional code base.

When passing a JavaScript function as a parameter in another function, is it possible to access the other variables passed? [closed]

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I have a JavaScript function like this:
obj.use('hello', function () {
// Here I want to access the string 'hello'
});
Is this at all possible, or are there any good workarounds that I can use?

My answer is based on the assumption that your usage indicates use as being a method of the object obj. In which case the way to achieve your objective is to use the same object to store the first parameter to obj.use.
var obj = {
use: function(greeting, fn) {
obj.greeting = greeting;
fn();
}
}
obj.use('hello', function () {
console.log(obj.greeting); //output: 'hello'
});

// Here I want to access the string 'hello'
Well that's easy, you just store the string in a variable whose scope is accessible inside the method:
var greeting = 'hello';
obj.use(greeting, function () {
console.log(greeting); // logs "hello"
});

How add function name to handler click? [closed]

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I have a button and I have function which should execute on click.
example:
<button id="button1">bla bla</button>
<script>
var justFunctionName = "function1";
var function1 = function()
{
alert("!");
}
$("#button1").click(justFunctionName);
</script>

HTML
<button id="button1">bla bla</button>
jQuery
var justFunctionName = "function1";
function function1()
{
alert("!");
}
$("#button1").on("click", window[justFunctionName]);
See working jsFiddle demo

$("#button1").click(justFunctionName);
should be
$("#button1").click(function1);

var justFunctionName = "function1";
This is assigning the string function1 to the variable justFunctionName.
If you were to do: console.log('justFunctionName'); you would end up with the following result:
>function1
Therefore this variable assignment is completely irrelevant for what you are hoping to achieve. Instead of just assigning a variable to a function you are assigning a variable to a variable which is assigned to a function.
Now take a look at what you are doing here:
var function1 = function () {
alert("!");
};
This is assigning a variable function1 to the function doing the alert. In this instance, think of the variable as a reference to the function. In order to have the button trigger the alert, you need to call the reference to the function (in this case function1):
$("#button1").click(function1);