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Format numbers w/ commas

/ Published in: JavaScript
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  1. function formatNumber(num, prefix){
  2.    prefix = prefix || '';
  3.    num += '';
  4.    var splitStr = num.split('.');
  5.    var splitLeft = splitStr[0];
  6.    var splitRight = splitStr.length > 1 ? '.' + splitStr[1] : '';
  7.    var regx = /(\d+)(\d{3})/;
  8.    while (regx.test(splitLeft)) {
  9.       splitLeft = splitLeft.replace(regx, '$1' + ',' + '$2');
  10.    }
  11.    return prefix + splitLeft + splitRight;
  12. }
  13.  
  14. function unformatNumber(num) {
  15.    return num.replace(/([^0-9\.\-])/g,'')*1;
  16. }
  17.  
  18.  
  19. //Usage:
  20. var test1 = formatNumber('5123456789.25'); // returns 5,123,456,789.25
  21. var test2 = formatNumber(1234.15,'$');     // returns $1,234.15
  22. var test3 = unformatNumber('$1,234.15');   // returns 1234.15

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