In other languages (like C++ or C#) I can make a public variable inside of a class. I want to make a global variable inside of a function.
Example:
let idk = function(){
let num = 5;
};
// use the variable in global scope
console.log(num);
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user229044
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kanaria
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Leave the `let` off `let num = 5;`, but that's usually an anti-pattern. – Jared Farrish May 06 '18 at 02:39
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Any good tutorial on variable scoping in javascript would explain different scenarios to you – charlietfl May 06 '18 at 02:42
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2Possible duplicate of [Declare a global variable from inside a function](https://stackoverflow.com/questions/10608656/declare-a-global-variable-from-inside-a-function) – faintsignal May 06 '18 at 02:43
4 Answers
2
You can declare the variable outside without assigning to it, then assign to the variable inside without declaring it:
let num;
let idk = function () {
num = 5;
};
// use the variable in global scope
console.log(num);
Ry-
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1
You can expose it with window - window.num = 5 if you are in a browser.
Or in Node, use global instead.
Daniel A. White
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0
You cannot create a global variable within a function since the scope of any variable created within a function cannot be global. But you can set value to a global variable from within the function. Hope this helps.
Srinivas GV
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if your program running on the browser than You can use like this
<script>
function foo() {
window.yourGlobalVariable = ...;
}
</script>
Or you can declire the variable oursite of the funciton and you can use it inside of the function
<script>
var globalVariable;
function bar() {
globalVariable = "set value into the global variable";
}
</script>
Hoque MD Zahidul
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