The while statement executes a statement until a specified condition is false.
Syntax
while (expression)
statement
The while statement syntax has these parts:
Part |
Description |
expression |
A Boolean expression checked before each iteration of the loop. If expression is true, the loop is executed. If expression is false, the loop is terminated.
|
statement |
The statement to be executed if expression is true. Can be a compound statement. |
Example
The while statement checks expression before a loop is first executed. If expression is false at this time, the loop is never executed.
The following example illustrates the use of the while statement:
function executeUntil(end)
{
var i=0 ;
while(i< 100)
{
if(i==end)
break ;
document.write("Java is fun");
i++;
}
return(i);
}
document.write(executeUntil(10));
|
 To run the code, paste it into JavaScript Editor, and click the Execute button.
See also: break statement, continue statement, do...while statement, for statement ,for...in statement |
