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Comments in JavaScript

Let’s take a quick look at the JavaScript comments, the following are some of important points about the comments.

  • Comments in JavaScript are used to explain the code and make the program more readable for developers.
  • In programming, comments can also be used to prevent some code lines from being executed. While testing it is more useful.
  • There are two types of comments in JavaScript: single-line and multi-line.
  • Single-line comment out one line or a part of one line and do not need to be closed.
  • Multiline comments can comment out block of code(a few lines) and need to be closed.

Single-line Comments

Single line comments start with //. Anything that goes after // until a line break is treated as a JavaScript comment and not executed as code.

// This is a number array
var arr1 = [1,2,3,4];

var x = 5;       // Variable declaration
var y = x + 99;  // Different variable

Multi-line Comments

Multi-line comments are more often used for formal documentations. start with /* and end with */. Any text inside the /* and */ will be ignored by JavaScript.

Below is the example for how to use the multi-line comments,

/*This is a number array.
We are going to add another element to the arr1
*/
var arr1 = [1,2,3,4];
arr1.push(5);

Happy Learning 🙂

See also  Remove the last character of String using JavaScript
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