What does “use strict” do in JavaScript, and what is the reasoning behind it?

Question

Recently, I ran some of my JavaScript code through Crockford\'s JSLint, and it gave the following error:

Problem at line 1 character 1: Missing \"use

Answer 1

Use Strict is used to show common and repeated errors so that it is handled differently , and changes the way java script runs , such changes are :

• Prevents accidental globals

• No duplicates

• Eliminates with

• Eliminates this coercion

• Safer eval()

• Errors for immutables

you can also read this article for the details