Immediately invoked anonymous function
-
anonymous, as the name suggests, allows creating a function without any names identifier. It can be used as an argument to other functions
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functions that wrap our code and create an enclosed scope around it, which help keep any state or privacy within that function
(function() { 'use strict'; // Your code here // All function and variables are scoped to this function })(); (function() { alert("Hello"); })()
setTimeout(function() {
alert('Demo');
}, 3000);
<!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>
la, di, lah