Javascript Programming Tutorials, Guides & Best Practices

for (let i = 0; i < 5; i++) {
    console.log("Iteration: " + i);
}

let i = 0;
while (i < 5) {
    console.log("Iteration: " + i);
    i++;
}

A closure is a function that "remembers" the environment in which it was created. In JavaScript, closures are created every time a function is created. A closure gives you access to the outer function’s scope from an inner function. In other words, a closure is a combination of a function and the lexical environment within which that function was declared.

Closures are essential because they enable powerful and flexible programming techniques. They allow you to: