Looping

Very often when you write code, you want the same block of code to run a number of times. You can use looping statements in your code to do this.

In JavaScript we have the following looping statements:

• while – loops through a block of code while a condition is true
• do…while – loops through a block of code once, and then repeats the loop while a condition is true
• for – run statements a specified number of times

while

The while statement will execute a block of code while a condition is true.. 

while (condition)
{
    code to be executed

}
do...while
The do...while statement will execute a block of code once, and then it will repeat the loop while a condition is true

do
{
    code to be executed
}
while (condition)

for

The for statement will execute a block of code a specified number of times