Question

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Difference between using var and not using var in JavaScript

Hello,

I am a self learned developer. Always, i write javascripts without the var for variables. But some javascripts use var for variables.

Both worked well for me. I am bit confused by this.

Is Writing scripts with var a standard form or they used only within classes ?

Answer 1

var limits the scope of a variable to the function it is declared in, if you don’t use var you create a global.

Globals tend to lead to code that is hard to maintain and suffers from race conditions.

Always use var unless you have a very good reason not to.