An introduction to ‘use strict’ JavaScript feature with real-world examples
JavaScript ‘use strict’
Introduction
The strict mode of JavaScript prevents accidental global variable declarations and improves code quality by catching errors earlier in the development process.
For large projects and codebases, usinguse strictis recommended as a best practice because it can help catch potential errors and improve the security and reliability of your code.
Examples
Here are two examples of how use strict can enforce stricter coding practices and catch potential errors early in JavaScript:
Variables must be declared before use
Using a variable without explicitly declaring it will throw an error in strict mode.