Making an array with 2 digit numbers in javascript

Question

Let's say that i got a variable which it contains the number 19. I want to make an array from it with the following numbers

var positions = [ "00", "01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19" ];

How is this possible in javascript?

i know that i if the number is for example 9 i can make it 09 with the following line: `var totalplayers = ("0" + totalplayers).slice(-2);` But i cant build an array with all the numbers from 00 to totalplayers — Alex Bogias, May 06 '12 at 13:37
http://stackoverflow.com/questions/1267283/how-can-i-create-a-zerofilled-value-using-javascript — jbabey, May 06 '12 at 13:37

drinchev · Accepted Answer · 2012-05-06T13:50:10.363

3

Something like :

var number = 19;
var arr = [];
for ( i = 0; i <= number ; i++ ) {
   arr.push(i < 10 ? ("0" + i.toString()) : i.toString());
}

demo : http://jsfiddle.net/Kfnnr/1/

edited May 06 '12 at 13:50

answered May 06 '12 at 13:42

drinchev

19,201
4
67
93

1

Or more simply : arr.push ((i < 10 ? '0' : '') + i) – HBP May 06 '12 at 14:22

KooiInc · Answer 2 · 2019-11-30T14:17:04.310

Alternatively:

var mynumber = 19,
    myarr = String(Array(mynumber+1))
            .split(',')
            .map(function(el,i){return i<10 ? '0'+i : ''+i;});

For zeropadding you may want to use:

function padLeft(nr,base,chr){
  base = base || 10;
  chr = chr || '0';
  var  len = (String(base).length - String(nr).length)+1;
  return len > 0? Array(len).join(chr)+nr : nr;
}
// usage
padLeft(1);           //=> '01'
padLeft(1,100);       //=> '001'
padLeft(1,10000,'-'); //=> '----1'

Update 2019: in es20xx String.prototype contains a native padStart method:

"1".padStart(2, "0"); //=> "01"
//           ^ max length
//               ^ fill string (or space if omitted)

score 1 · Answer 3 · answered May 06 '12 at 13:55

1

essentially you want to pad 0's and the answers here will not suffice and scale when the number is changed.. Probably the better solution would be

function padZero(num, size) {
    var s = num+"";
    while (s.length < size) s = "0" + s;
    return s;
}

answered May 06 '12 at 13:55

Baz1nga

15,485
3
35
61

?? What do you mean with *will not suffice and scale when the number is changed*? – KooiInc May 06 '12 at 14:07
well if the number was 20000 then would you write i<10000 and i<1000 etc. I was talking before you updated your answer – Baz1nga May 06 '12 at 14:16

score 1 · Answer 4 · answered Nov 19 '19 at 13:53

Using this example finally solved my own @@iterator function interface issue; Thanks a lot

var myArray = [];
function getInterval (start, step, end, ommit){
    for (start; start <= end; start += step) {
  myArray.push( start < 10 ? ("" + start.toString()) : start.toString());
  
    }
            }

getInterval(2, 2, 20, 20);

myArray; // __proto__: Array
// (10) ["2", "4", "6", "8", "10", "12", "14", "16", "18", "20"]
myArray[4]; // "10"

Making an array with 2 digit numbers in javascript

4 Answers4