How to iterate numbers 001 002 ... with javascript

Question

How to iterate numbers 001 002 ... 010 011 012 ... 100 101 102... with javascript? I tried as following, it works wen num is over 100, however num under 100, it doesn't work. Please teach me better way.

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Pages</title>
</head>
<body>

<script language="JavaScript">

document.write('<table width="650"><tr><td>');
    num = 123; 
    var i, j, k = num;
    numlen = num.length; 

    if (numlen == 1 ) {
        for (var i=1; (i<num); i++) { 
        document.write('00'+i+' ');
        }
    }
    else if (numlen == 2) {
        for (var i=1; (i<10); i++) {
        document.write('00'+i+' ');
        }
        for (var i=10; (i<=num); i++) {
        document.write('0'+i+' ');
        }
    }
    else {
        for (var i=1; (i<10); i++) {
        document.write('00'+i+' ');
        }
        for (var i=10; (i<100); i++) {
        document.write('0'+i+' ');
        }
        for (var i=100; (i<=num); i++) {
        document.write(i+' ');
        }
    }
document.write('</td></tr></table>');

</script>

</body>

score 2 · Accepted Answer · answered Nov 18 '13 at 14:45

2

Try this:

function pad(s) 
{ 
   while (s.length < 3) 
      s = '0' + s; 
   return s; 
};


// your code

for (var i=1; i<num; i++) { 
   document.write(pad(''+i));
}

You don't need (and really shouldn't do) different loops. One will do, just be sure to pad each number with the right amount of leading zeros, calling "pad" function.

answered Nov 18 '13 at 14:45

LittleSweetSeas

6,786
2
21
26

Woo~, wonderful! very simple and fascinating. Thank you very much! – user3005045 Nov 18 '13 at 15:13

score 0 · Answer 2 · answered Nov 18 '13 at 14:48

0

for (var i=1; i<1000; i++) {
 document.write(((i+1000)+"").substr(1));
}

answered Nov 18 '13 at 14:48

Alexander

19,906
19
75
162

Roy Dictus · Answer 3 · 2013-11-21T15:00:59.267

0

How about this -- very efficient (more so than padding with while):

var i;
for (i = 1; i <= upperLimit; i++)
{
   var text = '00' + i;
   document.write(text.substr(text.length - 3, 3);
}

edited Nov 21 '13 at 15:00

answered Nov 18 '13 at 14:49

Roy Dictus

32,551
8
60
76

How to iterate numbers 001 002 ... with javascript

3 Answers3