What does “use strict” do in JavaScript, and what is the reasoning behind it?
“use strict” mode in JavaScript
35620-Jul-2021
Updated on 20-Jul-2021
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What does “use strict” do in JavaScript, and what is the reasoning behind it?
Anonymous User
04-Aug-2021Strict Mode is a new feature in ECMASCRIPT 5 that makes your program or function in a 'strict' operating context. The strict context prevents certain functions from doing and throwing more exceptions with a trivially malformed way of logic.
Syntax to apply strict mode :
To use the strict mode in JavaScript use statement 'use strict';
Strict mode was a new feature in ECMAScript 5 that allows you to place a program or function in a 'strict' operating context. This strict reference prevents certain actions from happening and throwing more exceptions. statement 'use strict'; Instructs the browser to use strict mode, which is a less secure feature set of JavaScript.
Benefits of using strict: Strict mode introduces many changes to normal JavaScript semantics.
Let's understand it with the help of an example :
When you run the above code you will find that in console it will throw an error 'strict.html:14 Uncaught ReferenceError: x is not defined'. This would be because of the strict method of Javascript.
Hope this description will be helpful for you.
Happy Coding!