JavaScript Break
The break statement "jumps out" of loops and switches.
The Break Statement
The break statement "jumps out" of loops and switches.
The break statement terminates the execution of a loop or a switch statement.
Break in Loops
When break is encountered in a loop, the loop terminates immediately. The program control is transfered to the statements following the loop.
No more loop iterations are executed.
Example
Example Code
javascriptfor (let i = 0; i ";
}Break in a Switch
In a switch statement, a break statement will exit the switch block after a matching case is executed. Without break, execution would "fall through" to subsequent case blocks.
Example
Example Code
javascriptswitch (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";
}JavaScript Labels
A label provides a name for a statement, or a block of statements, allowing statements to be referenced to, for program flow control, particularly in loops.
Syntax
Example Code
javascriptlabelname: statement;Labeled Break
Syntax
Example Code
javascriptbreak labelname;The break statement exits a loop or block and transfers the control to the labeled statement.
The break statement is particularly useful for breaking out of inner or outer loops from nested loops.
Example
Example Code
javascriptlet text = "";
loop1: for (let j = 1; j break and continue
> are the only JavaScript statements that can "jump out of" a code block.
> A code block is a block of code between { and }.
> Without a label reference, break can only
> jump out of a loop or a switch.
> With a label reference, break can jump out
> of any code block:
### Examplejavascript const cars = ["BMW", "Volvo", "Saab", "Ford"]; list: { text += cars[0] + " ";
text += cars[1] + " "; break list; text += cars[2] + " ";
text += cars[3] + " "; } ```
Interactive Code Examples
JS Example 1
javascriptfor (let i = 0; i < 10; i++) {
if (i === 3) { break; }
text += "The number is " + i + "<br>";
}JS Example 2
javascriptswitch (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";
}JS Example 5
javascriptlet text = "";
loop1: for (let j = 1; j < 5; j++) {
loop2: for (let i = 1; i < 5; i++) {
if (i === 3) { break loop1; }
text += i;
}
}JS Example 6
javascriptlet text = "";
loop1: for (let j = 1; j < 5; j++) {
loop2: for (let i = 1; i < 5; i++) {
if (i === 3) { break loop2; }
text += i;
}
}