I am trying to add the returned value from the test() function into a variable result, but += does not seem to work. I get the error "invalid variable initialization". I also tried replacing i++ to i+= which didnt work either. Maybe I'm totally wrong and should use a while loop instead? I'm quite lost..

I want 'result' to look something like this:

var result = no no no 0no 0no no;

etc (with no whitespace, of course).

Any help much appreciated! Thanks

function test(no){

            if (no <= 15){              
                return '0' + parseInt(no);
            }

            else {              
                return parseInt(no); 
            }       
}


        for(i = 0; i < pics.length; i++){

            var b = pics[i].value;

            var result += test(b);

        }

I am trying to add the returned value from the test() function into a variable result, but += does not seem to work. I get the error "invalid variable initialization". I also tried replacing i++ to i+= which didnt work either. Maybe I'm totally wrong and should use a while loop instead? I'm quite lost..

I want 'result' to look something like this:

var result = no no no 0no 0no no;

etc (with no whitespace, of course).

Any help much appreciated! Thanks

function test(no){

            if (no <= 15){              
                return '0' + parseInt(no);
            }

            else {              
                return parseInt(no); 
            }       
}


        for(i = 0; i < pics.length; i++){

            var b = pics[i].value;

            var result += test(b);

        }

• javascript
• for-loop

Share Improve this question Follow edited Feb 15, 2012 at 14:35 Chris Barlow 3,31444 gold badges3434 silver badges5252 bronze badges asked Nov 18, 2009 at 19:23 patadpatad 9,6921111 gold badges4242 silver badges4444 bronze badges 2

• Given the syntax and variable names, I'm assuming JavaScript and have retagged as such. ActionScript (or any other ECMAScript-based language) is another likely choice, but they have identical syntaxes in this example. – Cory Petosky Commented Nov 18, 2009 at 19:29
• sorry should have taged it as javascript, my bad – patad Commented Nov 18, 2009 at 19:33

Add a ment  | 

3 Answers 3

Sorted by: Reset to default 5

Every time your loop starts, var result goes away. You need to move it outside the loop:

var result = ''; // lives outside loop
for(i = 0; i < pics.length; i++)
{
    var b = pics[i].value;
    result += test(b);
}

you need to initialize result as a string not as a var.

e.g.

outside the loop

string result = string.Empty;

for loop

result += test(b);

end for loop

You are seeing that error because you are using the increment operator on a newly declared variable. Use '=':

for(i = 0; i < pics.length; i++)
{
   var b = pics[i].value;
   var result = test(b);
}

Although, as GMain pointed out, the real solution is to move the 'result' variable declaration outside of the for loop.