Saturday, 10 March 2018
A closure in JavaScript is an inner function that has access to its outer function's scope, even after the outer function has returned control. A closure makes the variables of the inner function private. A
Simple example of a closure is shown below:
var count = (function () {
var _counter = 0;
return function () {return _counter += 1;}
})();
count();
count();
count();
// the counter is now 3
The variable count is assigned an outer function. The outer function runs only once, which sets the counter to zero and returns an inner function. The _counter variable can be accessed only by the inner function, which makes it behave like a private variable.
return function () {return _counter += 1;}
})();
count();
count();
count();
// the counter is now 3
The variable count is assigned an outer function. The outer function runs only once, which sets the counter to zero and returns an inner function. The _counter variable can be accessed only by the inner function, which makes it behave like a private variable.
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