Question

What is the significance, and what are the benefits, of including 'use strict' at the beginning of a JavaScript source file?

Answer 1

The significance and benefits of using 'use strict' in JavaScript

Step-by-step explanation:

Significance and Benefits of 'use strict' in JavaScript

The 'use strict' directive is used in JavaScript to enable strict mode, which enforces stricter rules for writing JavaScript code. When enabled, strict mode helps to reduce common programming errors and increases the overall reliability of code. Some of the benefits of using 'use strict' include preventing the use of undeclared variables, eliminating the use of duplicate function parameters, and making the 'this' keyword behave differently.

In order to include 'use strict' at the beginning of a JavaScript source file, you simply add the line 'use strict'; (or 'use strict'; in strict mode).