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JavaScript closures vs. anonymous functions
Anonymous Functions
Anonymous, as the name suggests, allows creating a function without any names identifier. It can be used as an argument to other functions. They are called using the variable name:
This is how JavaScript anonymous functions can be used:
var func = function() {
alert(‘This is anonymous');
}
func();Another example can be the following:
setTimeout(function() {
alert('Demo');
}, 3000);JavaScript Closures
In JavaScript, all functions work like closures. A closure is a function, which uses the scope in which it was declared when invoked. It is not the scope in which it was invoked.
Here’s an example:
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Closures</h2>
<script>
var p = 20;
function a() {
var p = 40;
b(function() {
alert(p);
});
}
function b(f) {
var p = 60;
f();
}
a();
</script>
</body>
</html>
Updated on: 12-Sep-2019
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