Asked by: Duncan Heuwinkel
asked in category: General Last Updated: 23rd May, 2020

When to use let and VAR in JavaScript?

let allows you to declare variables that are limited in scope to the block, statement, or expression on which it is used. This is unlike the var keyword, which defines a variable globally, or locally to an entire function regardless of block scope.

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Also asked, should I use let or VAR in Javascript?

Difference between var and let in JavaScript. var and let are both used for variable declaration in javascript but the difference between them is that var is function scoped and let is block scoped. It can be said that a variable declared with var is defined throughout the program as compared to let.

can I use let Javascript? EDIT: let and const are supported by all modern browsers and are part of the ECMAScript 2015 (ES6) specification. Basically if you don't need to support anything below IE11, let and const are safe to use nowadays.

One may also ask, should you use let or VAR?

let is the new var . Apparently the only difference is that var gets scoped to the current function, while let gets scoped to the current block. And if you want to scope something more finely in an for block or something, then you can do that too. So my instinct is to stop using var altogether when writing ES6 code.

What does VAR do in Javascript?

var is used to declare the variable in javascript. var msg=""; means you declared the variable msg which is empty and same with the focusname .

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