5. Comments and Readability

Code is read far more often than it is written. Comments help explain why the code is doing what it's doing.

1. Single-Line Comments

Use two forward slashes (//).

javascript // This line declares a variable to hold the user's name let userName = 'Alice';

let age = 30; // Inline comments can explain tricky parts

2. Multi-Line Comments

Used for longer explanations, or temporarily commenting out large blocks of code. Start with /* and end with */.

javascript /* This function calculates the total price, including tax and shipping costs. It needs three parameters: base price, tax rate, and a boolean flag for premium shipping. */ function calculateTotal(price, tax, premium) { // ... function logic }

Best Practices for Readability

1. Meaningful Names: Variables and functions should clearly state their purpose (e.g., use firstName instead of fn).
2. Consistent Formatting: Use indentation (usually 2 or 4 spaces) consistently.
3. Avoid Excessive Comments: If the code is clear, the comment is redundant.