JavaScript While Loop

Last Updated Jul 29, 2015, 07:00:14 PM




JavaScript While Loop

The while statement creates a loop that executes a specified statement as long as the test condition evaluates to true. The condition is evaluated before executing the statement.

Syntax

Values

condition

An expression evaluated before each pass through the loop. If this condition evaluates to true, a statement is executed. When condition evaluates to false, execution continues with the statement after the while loop.

statement

A statement that is executed as long as the condition evaluates to true. To execute multiple statements within the loop, use a block statement ({ ... }) to group those statements.

Example

Each iteration, the loop increments n and adds it to m. Therefore, m and n take on the following values:

After the first pass: n = 1 and m = 1

After the second pass: n = 2 and m = 3

After the third pass: n = 3 and m = 6

After the third pass: n = 4 and m = 12

After completing the third pass, the condition n < 10 is no longer true, so the loop terminates.

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Other JavaScript conditions you might want to learn
JavaScript If Statement

JavaScript if else Statement

JavaScript switchcase Statement

Browser compatibility

Feature
while loop Yes Yes Yes Yes Yes Yes Yes


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Sources and Credits

The source of the content has been referred and updated with Mozilla Developer Network and W3C Organization

Last Updated Jul 29, 2015, 07:00:14 PM