Programming with ECMAScript 2015 : Variables and Scopes | packtpub.com

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Variables and Scopes are two important things to understand in JavaScript programming. Scope deals with the availability and access of a variable within your code blocks. Scope in JavaScript is function scoped and it leads to a lot of confusion.
• ECMAScript introduces 2 new variable declaration keywords: let and const. These new keywords can be used to declare variables in your code
• “let” allows you to create variables whose value can be changed later. “const” allows you to create variables whose value cannot be changed.
• “let” and “const” declared variables will be block scopes, compared to “var” declared variables which are function scoped. It is advised to use let or const as against var.

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