JavaScript Comments to Prevent Execution
We can use // or /*…*/ to change the JavaScript code execution using comments. JavaScript Comments are used to prevent code execution and are considered suitable for testing the code.
Example 1: JavaScript comments are used to prevent execution of selected code to locate problems of code or while testing new features. This example illustrates that commented code will never execute.
function add() {
let x = 10;
let y = 20;
let z = x + y;
// console.log(x + y);
console.log(z);
}
add();
Output
30
Example 2: This example uses multi-line comments to prevent the execution of addition code and perform subtraction operations.
function sub() {
let x = 10;
let y = 20;
/* let z = x + y;
console.log(z); */
let z = x - y;
console.log(z);
}
sub();
Output
-10
JavaScript Comments
JavaScript comments help explain code, making it easier to understand. You can also use them to temporarily disable parts of your code. The JavaScript compiler ignores comments when running the code.
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