How to label a block in JavaScript?
A block statement groups zero or more statements. In languages other than JavaScript, it is known as a compound statement.
Syntax
Here’s the syntax −
{
//List of statements
}To add a label to a block, use the following −
Identifier_for_label: {
StatementList
}Let’s use it for break statement. You can try to run the following code to use labels to control the flow, with break statement
Example
Live Demo
<html>
<body>
<script>
document.write("Entering the loop!<br /> ");
outerloop: // This is the label name
for (var i = 0; i < 5; i++) {
document.write("Outerloop: " + i + "<br />");
innerloop:
for (var j = 0; j < 5; j++) {
if (j > 3 ) break ; // Quit the innermost loop
if (i == 2) break innerloop; // Do the same thing
if (i == 4) break outerloop; // Quit the outer loop
document.write("Innerloop: " + j + " <br />");
}
}
document.write("Exiting the loop!<br /> ");
</script>
</body>
</html>
Published on 23-Jan-2018 13:53:40
