JavaScript: label statement

Last update on May 28 2022 10:26:51 (UTC/GMT +8 hours)

Description

Label statement provides an identifier for a statement that lets you refer to it using a break or continue statement.

Syntax

label :
statements

Parameters

label: Any JavaScript identifier that is not a reserved word.

statements: Group of statements. "Break" can be used with any labeled statement, and "continue" can be used with looping labeled statements.

Example:

The following web document demonstrates how label statement can be used.

HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset=utf-8>
<title>JavaScript label statement :  Example-1</title>
</head>
<body>
<h1 style="color: red">JavaScript : label statement</h1>
<script src="label-statement-example1.js"></script>
</body>
</html>

JS Code

labelmark:
for(x=0; x<6; x++)
{
var newParagraph1 = document.createElement("p");
var newText1 = document.createTextNode("The value of x is : " +x);
newParagraph1.appendChild(newText1);
document.body.appendChild(newParagraph1);
if(x==3)
{
break labelmark;
}
}
var newParagraph1 = document.createElement("p");
var newText1 = document.createTextNode("The last value of x is : " +x);
newParagraph1.appendChild(newText1);
document.body.appendChild(newParagraph1);

View the example in the browser

Practice the example online

See the Pen label-1 by w3resource (@w3resource) on CodePen.

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Next: JavaScript: break statement

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04