Advanced JavaScript Concepts

JavaScript is a versatile and powerful language that enables developers to create dynamic and interactive web applications. To take full advantage of JavaScript, it’s essential to understand its advanced concepts, such as closures, prototypes, and asynchronous programming.

Closures

A closure is a function that "remembers" the variables from its lexical scope even when executed outside that scope.

Example:

function createCounter() {
  let count = 0
  return function () {
    count++
    return count
  }
}

const counter = createCounter()
console.log(counter()) // 1
console.log(counter()) // 2