JS Strict Mode
13 min read
What is JS Strict Mode?
In this lesson, we explore JS Strict Mode. This is an important concept in JavaScript development that you will use frequently when building real-world projects. Understanding JS Strict Mode will help you write cleaner, more efficient code.
Syntax & Usage
The syntax and usage patterns for JS Strict Mode follow standard JavaScript conventions. Below you will see code examples that demonstrate the most common use cases. Try modifying these examples in your own editor to experiment with different approaches.
Example
Here is a practical example demonstrating JS Strict Mode:
Tips & Best Practices
- Use
constby default,letwhen you need to reassign - Use strict equality (
===) instead of loose equality (==) - Handle errors with try/catch blocks for robust code
- Use template literals instead of string concatenation
Summary
In this lesson you learned about JS Strict Mode. Practice writing code to reinforce these concepts and move on to the next lesson when you feel comfortable.
Examples
javascript
// JS Strict Mode
let message = 'Hello World';
console.log(message);
function example() {
return 'This is a JavaScript example';
}
console.log(example());