Angular filter to convert numbers to thousand suffixes (1234 > 1.2k)

filter.js

// Based on http://stackoverflow.com/questions/1571374/converting-values-to-unit-prefixes-in-jsp-page.
// The inner filter function can be used standalone.

angular.module('Utils')
  .filter('thousandSuffix', function () {
    return function (input, decimals) {
      var exp, rounded,
        suffixes = ['k', 'M', 'G', 'T', 'P', 'E'];

      if(window.isNaN(input)) {
        return null;
      }

      if(input < 1000) {
        return input;
      }

      exp = Math.floor(Math.log(input) / Math.log(1000));

      return (input / Math.pow(1000, exp)).toFixed(decimals) + suffixes[exp - 1];
    };
  });