Скачать или смотреть JavaScript Let vs Var vs Const - JS/ES6 | Shahan

In this video I cover the let, const & var keywords in JavaScript (ES6)

var:
hoisted (always declared at top of scope, global if none)
function scope
let:
block scope
not redeclarable
const:
block scope
not reassignable
not redeclarable

var declarations are globally scoped or function scoped while let and const are block scoped. var variables can be updated and re-declared within its scope; let variables can be updated but not re-declared; const variables can neither be updated nor re-declared. They are all hoisted to the top of their scope.

The let and const declarations provide better scope management than the traditional var. Plus the var keyword may confuse programmers coming from other languages like VB or Java that use var to declare variables, but with different rules.

So make sure to use const over let. We use let only when we want to reassign a variable. So that's all about var vs let vs const in ES6 of JavaScript.

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