Closures

_Closures.md

Closures

Closures are scope-bounded bindings.

When can i use them?

• hide variables
• hide private functions
• factories

example1.js

function counterFactory() {
    var counter = 0;

    return function () {
        return counter += 1;
    } 
}

// counter is hidden within the closure 
console.log('counter: ', counter); // ReferenceError: counter is not defined. 

// we can use closure for creating function factories
const count = counterFactory();
console.log('count: ', count()); // 1
console.log('count: ', count()); // 2
console.log('count: ', count()); // 3
console.log('count: ', count()); // 4