While loop statements in Javascript.

Using while statements

The while loop statement

• A while loop statement has the form:

  while (expression) {
      statement;
  }

• In a "while" loop, any statements that form the body of the loop is executed as long as the expression evaluates to true.

  <script type="text/javascript">
  var count = 0;             // initialize the condition
    while(count < 5) {       // test condition still true
      count++;               // body of the loop starts
      document.write("count: "+count+"<br>");
    }
    document.write("At end Count: "+count+"<br>");
  </script>

The do while loop statement

• A do while loop statement has the form:

  do {
      statement;
  } while (expression);

• In a "do while" loop, all the statements that form the body of the loop is executed once before the evaluation of the expression. Otherwise, this loop works the same way that "while" loop.

  <script type="text/javascript">
    var count = 0;           // initialize the condition
    do {
      count++;               // body of the loop starts
      document.write("count: "+count+"<br>");
    } while(count<5)         // test condition still true
    document.write("At end Count: "+count+"<br>");
  </script>