JavaScript Arrow functions were introduced in ES6. The main advantage is, it has shorter syntax.

When we copy an object or array and all the level properties are copied without any reference, then

Immutable datas in JavaScript can not change their values. If we change value of objects immutably,

Lexical scope means any child’s scope has access to the variables defined in parent’s scope

The DOM allows us to dynamically access and manipulate the HTML contents. There are some built in