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What are JavaScript Function Closures?
JavaScript function closure is the grouping of a function and where that function was declared. In JavaScript, all functions work like closures. A closure is a function uses the scope in which it was declared when invoked. It is not the scope in which it was invoked.
Here’s an example
<!DOCTYPEhtml>
<html>
<body>
<h2>Working with JavaScript Closures</h2>
<script>
var num = 10;
function a() {
var num = 15;
b(function() {
alert(num);
});
}
function b(f) {
var num = 30;
f();
}
a();
</script>
</body>
</html>
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