Global Scope means the defined data type can be accessed from anywhere in a JavaScript program. JavaScript Global Scope concept is related Variables.
let a = "Global Scope";
function greet () {
console.log(a);
}A variable declared outside of a function is considered a global scope variable. This variables can be accessed from anywhere in a JavaScript program.
JavaScript Global Scope
Simple example variables declared with var, let and const are quite similar when declared outside a block.
<!DOCTYPE html>
<html>
<body>
<script>
var x = "Global";
let y = "Scoop";
const z = "Example";
function print(){
console.log(x,y,z)
}
print();
</script>
</body>
</html>
Output:
The value of a global variable can be changed inside a function.
<script>
let a = "Hello";
function greet() {
a = 100;
}
console.log(a);
greet();
console.log(a);
</script> Output:
Hello
100If a variable is used without declaring it, that variable automatically becomes a global variable.
function greet() {
a = "hello"
}
greet();
console.log(a); // helloDo comment if you have any doubts or suggestions on this Js scope topic.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version
Degree in Computer Science and Engineer: App Developer and has multiple Programming languages experience. Enthusiasm for technology & like learning technical.