The While Loop In JavaScript
JavaScript includes a while loop to execute code repeatedly till it satisfies a specified condition. Unlike for loop, while loop only requires condition expression.
Syntax:
while(condition expression) { /* code to be executed till the specified condition is true */ }Example
In the following example, the code in the loop will run, over and over again, as long as a variable (i) is less than 10:
while (i < 10) {
text += “The number is ” + i;
i++;
}
The Do/While Loop In JavaScript
JavaScript includes another flavor of the while loop, which is a do-while loop. The do-while loop is similar to the while loop the only difference is it evaluates condition expression after the execution of the code block. So do-while loop will execute the code block at least once.
Syntax:do{ //code to be executed }while(condition expression)Example
The example below uses a do/while loop. The loop will always be executed at least once, even if the condition is false because the code block is executed before the condition is tested:
do {
text += “The number is ” + i;
i++;
}
while (i < 10);
