JavaScript break Statement
JavaScript Statements Reference
Example
In this example we use a for loop together with the break statement.
Loop through a block of code, but exit the loop when the variable i is equal to "3":
var text = ""
var i;
for (i = 0; i < 5; i++) {
if (i ===
3)
{
break;
}
text += "The number is " + i + "<br>";
}
The result of text will be:
The number is 0
The number is 1
The number is 2
Try it Yourself »
More "Try it Yourself" examples below.
Definition and Usage
The break statement exits a switch statement or a loop (for, for ... in, while, do ... while).
When the break statement is used with a switch statement, it breaks out of the switch block. This will stop the execution of more execution of code and/or case testing inside the block.
When the break statement is used in a loop, it breaks the loop and continues executing the code after the loop (if any).
The break statement can also be used with an optional label reference, to "jump out" of any JavaScript code block (see "More Examples" below).
Note: Without a label reference, the break statement can only be used inside a loop or a switch.
Browser Support
| Statement | |||||
|---|---|---|---|---|---|
| break | Yes | Yes | Yes | Yes | Yes |
Syntax
break;
Using the optional label reference:
break labelname;
Technical Details
| JavaScript Version: | 1.0. The label reference was added in JavaScript 1.2 |
|---|
More Examples
Example
In this example we use a while loop together with the break statement.
Loop through a block of code, but exit the loop when the variable i is equal to "3":
var text = "";
var i = 0;
while (i < 5) {
text
+= "<br>The number is " + i;
i++;
if (i === 3) {
break;
}
}
The result of text will be:
The number is 0
The number is 1
The number is 2
Try it Yourself »
Example
Break out of a switch block to ensure that only one case is executed:
var day;
switch (new Date().getDay()) {
case 0:
day = "Sunday";
break;
case 1:
day = "Monday";
break;
case 2:
day = "Tuesday";
break;
case 3:
day = "Wednesday";
break;
case 4:
day = "Thursday";
break;
case 5:
day = "Friday";
break;
case 6:
day = "Saturday";
break;
}
The result of day will be:
Try it Yourself »
Example
Using the break statement with a label reference, to "jump out" of a JavaScript code block:
var cars = ["BMW", "Volvo", "Saab", "Ford"];
var text = "";
list:
{
text += cars[0] + "<br>";
text += cars[1] + "<br>";
text += cars[2] + "<br>";
break list;
text += cars[3] +
"<br>";
}
The result of text will be:
BMW
Volvo
Saab
Try it Yourself »
Example
Using the break statement with a label reference, to "jump out" of a nested for loop:
var text = "";
var i, j;
Loop1: // The first for loop is labeled
"Loop1"
for (i = 0; i < 3; i++) {
text += "<br>" + "i = " + i + ", j =
";
Loop2: // The second for loop is labeled
"Loop2"
for (j = 10; j < 15; j++) {
if (j === 12) {
break Loop2;
}
document.getElementById("demo").innerHTML = text += j + " ";
}
}
The result of text will be:
i = 0, j = 10 11
i = 1, j = 10 11
i = 2, j = 10 11
Try it Yourself »
Related Pages
JavaScript Tutorial: JavaScript Break and Continue
JavaScript Tutorial: JavaScript For Loop
JavaScript Tutorial: JavaScript While Loop
JavaScript Tutorial: JavaScript Switch
JavaScript Reference: JavaScript continue Statement
JavaScript Reference: JavaScript for Statement
JavaScript Reference: JavaScript while Statement
JavaScript Reference: JavaScript switch Statement
JavaScript Statements Reference
