How to make a variable in function() goes public?

Question

Note: Without Declaring a variable outside the function() first

Answer 1

function foo()
{
window.bar = 3.1415;
}

console.log(bar); // undefined

foo();
console.log(bar); // 3.1415

Answer 2

Jingga Sona 🐺 If your goal is not pullulate global namespace, you can use a single object containing all your "module global" vars or put all inside an anonymous function

Answer 3

Jingga Sona 🐺 See here
https://code.sololearn.com/W2W90m2IVf0a/?ref=app
Maybe it can be useful to you

Answer 4

Jingga Sona 🐺 I think that you have to read how define an object with constructor... Classic example is:

function Person(name, surname){
this.name= name
this.surname= surname
this.printMe= function(){
alert(this.name +' '+ this.surname);
}
}

var me= new Person('KrOW', 'Black')
me.printMe()

This is only the point of the "iceberg"

Answer 5

Jingga Sona 🐺 I mean why you asked it? You have a practical problem to solve in that way or is just your curiosity?

Answer 6

I think that Jingga Sona 🐺 want follow common suggestion to not "fill" the global namespace... With large codes can be useful but i dont know if this is him final goal

Answer 7

Jingga Sona 🐺 I highly suggest you to follow this guide https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects#Creating_new_objects

Answer 8

Thanks KrOW !👍

Answer 9

👍👍👍👍

Answer 10

neo.h This is a simple example, which make no difference from direct return a value. Closure is more applicable if we need to do encapsulation, and return only the required object.

Answer 11

Jingga Sona 🐺 Just for curiosity: Why?

Answer 12

Thanks! Can you explain it?

Answer 13

KrOW well, i am trying to make a small library called shortcut.js, and i want to include canvas basic program so it save times

Answer 14

I did not learn anonymous function yet😅

Answer 15

He wants to avoid declaring the variable outside, but yeah, I think the same

Answer 16

I have done the same before, but I stuffed all my functions inside an object

KrOW I cant speak for him. But I made something similar, to simply getting the context, resizing, clipping and drawing custom shapes. It's not a great deal but it's quite handy.

Answer 17

Use closure

var goo = function foo()
{
var bar = 3.1415;
return {bar};
}().bar;

console.log(goo); // 3.1415

https://code.sololearn.com/WXPFenTEzB6v/?ref=app

Answer 18

U could also assign a variable without let, const or var. Just variable = 5

Answer 19

Paul KrOW neo.h here i show you
https://code.sololearn.com/WJHWLNuvFTr2/?ref=app

Answer 20

Calviղ How's that different from a normal return?