JS Comments
JS Comments
Comments in JavaScript are used to add explanatory notes and remarks within the code. Comments are not executed by the JavaScript interpreter, and are instead ignored by the interpreter when the code is run. This makes comments a useful tool for adding context, explanations, and reminders to your code.
In JavaScript, there are two types of comments: single-line comments and multi-line comments.
- Single-line comments begin with // and continue until the end of the line. For example:
// This is a single-line comment
Multi-line comments begin with /* and end with */. They can span multiple lines and are often used to add longer explanations or disable blocks of code. For example:
/*
This is a multi-line comment
that spans multiple lines
*/
Comments can be added to any part of your JavaScript code, including variables, functions, and control structures. Here’s an example of a JavaScript function with comments added to explain what it does:
function calculateArea(width,height) {
// This function calculates the areaof a rectangle
let area = width * height;
return area;
}
As you can see, comments in JavaScript are a useful tool for adding clarity and context to your code, making it easier to understand and maintain.