JS - var, let & const in 30 seconds #shorts

Var is almost never used in modern javascript since es6 (ES2015) when let and const was introduced. A good strategy is to use const as much as you can. Look into the immutability pattern. Let variables can be updated but not re-declared. Const variables can neither be updated nor re-declared. Const Arrays and Objects can be mutated however. Let can be declared without being initialized. Const must be initialized during declaration. Let and const are block scoped. A block scope is the area within if, switch conditions or for and while loops. Generally speaking, whenever you see curly brackets. { }

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