JavaScript
Break and Continue
The break
statement "jumps out" of a loop.
The continue
statement "jumps over" one iteration in the loop.
The Break
Statement
You have
already seen the break statement used in an earlier chapter of this tutorial.
It was used to "jump out" of a switch() statement.
The break
statement can also be used to jump out of a loop.
The break
statement breaks the loop and continues executing the code after the loop (if
any):
Example
for
(i = 0; i < 10; i++) {
if (i === 3) { break; }
text += "The number is " + i +
"<br>";
}
»
The Continue
Statement
The continue
statement breaks one iteration (in the loop), if a specified condition occurs,
and continues with the next iteration in the loop.
This example
skips the value of 3:
Example
for
(i = 0; i < 10; i++) {
if (i === 3) { continue; }
text += "The number is " + i +
"<br>";
}
»
JavaScript
Labels
To label
JavaScript statements you precede the statements with a label name and a colon:
label:
statements
The break
and the continue statements are the only JavaScript statements that can
"jump out of" a code block.
Syntax:
break
labelname;
continue
labelname;
The continue
statement (with or without a label reference) can only be used to skip one loop
iteration.
The break
statement, without a label reference, can only be used to jump out of a loop or
a switch.
With a label
reference, the break statement can be used to jump out of any code block:
Example
var
cars = ["BMW", "Volvo", "Saab",
"Ford"];
list:
{
text += cars[0] + "<br>";
text += cars[1] + "<br>";
text += cars[2] + "<br>";
break list;
text += cars[3] + "<br>";
text += cars[4] + "<br>";
text += cars[5] + "<br>";
}
»
A code block
is a block of code between { and }.
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