Java script 5

JavaScript Loops

 

•  for

• while

•  do while 

  The for loop has the following syntax:

   

          for (statement 1; statement 2; statement 3)

          {
               code block to be executed
          }

 Example

for (i = 0; i < 5; i++) 

{
    text += "The number is " + i + "<br>";
}

The While Loop Syntax

while (condition) 

{
    code block to be executed
}

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 5:

Example

while (i < 5) 

{
    text += "The number is " + i;
    i++;
}

The Do/While Loop Syntax

The do/while loop is a variant of the while loop.

do {
    code block to be executed
}
while (condition);

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:

Example

do {
    text += "The number is " + i;
    i++;
}
while (i < 10);