JavaScript for statement

For statement syntax:

for (initialization; Expression post-loop-expression) statement
Initialization expression controls expression after loop expression

Example:

var count = ten;  for (var i = 0; i < count; i++) {    alert (i);}

The above code defines the initial variable of I as 0. The code in the loop body may not be executed only if the conditional expression (I < count) is present. If the code in the loop body is executed, it is bound to evaluate the post-loop expression (i++), which is the value of increment i.

This for Loop statement has the same functionality as the following while statement:

var count = ten; var i = 0;  while (I < count) {    alert (i);    I+ +;}

The For loop does not work with a while loop. In other words, the For loop simply concentrates the loop-related code in one place.

The VAR keyword can also be used in the initialization expression for a for loop. The initialization of the variable can be performed externally, for example:

var count = ten; var i;  for (i = 0; i < count; i++) {    alert (i);}

The initialization expression, control expression, and post-loop expression in the For statement are optional. Omitting all three expressions will create an infinite loop, for example:

 for (; ;) {        // infinite loop     dosomething ();}

JavaScript for statement