Question

135

How to Reverse a for loop?

rated 0 times [ 138] [ 3] / answers: 1 / hits: 15481 / 11 Years ago, mon, november 11, 2013, 12:00:00

I want to reverse the stars from (smallest to biggest) to (Biggest to smallest)

  function seethestars1() {

        for (var i = 0; i <= 10; i++) {

            for (var j = 0; j < i; j++) {

                document.getElementById(emptytext2).value += *;

            }

            document.getElementById(emptytext2).value += n;

        }

    }



 <textarea id=emptytext2 name=S2>



 <input id=emptytext3 type=button value=Click for the stars onclick =seethestars1() />

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keyonna

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answered 11 Years ago dahlias · Accepted Answer

You can use it like this

for (var i = 10; i >= 0; i--)

But I'm not sure why are you doing so because you are not using this variable inside your loop so I think it doesn't make any difference to the output as you loop going to run 10 times either way.

If I could guess then I think you want to print the stars in reverse order of quantity. That means you want to have maximum stars in first row then -1 in second and so on.. If so then you need to reverse the order of inner loop only like this

 function seethestars1() {

    var stars = document.getElementById(emptytext2);

    for (var i = 0; i <= 10; i++) {

        for (var j = 10; j > i; j--) {

            stars.value += *;

        }                            

      stars.value += n;

    }

}

Js Fiddle Demo