Closures
A closure gives you access to an outer function’s scope from an inner function.
In JavaScript, closures are created every time a function is created, at function creation time.
function init() {
var name = 'Mozilla'; // name is a local variable created by init
function displayName() { // displayName() is the inner function, a closure
alert(name); // use variable declared in the parent function
}
displayName();
}
init();
//Result
Mozilla