phpjs/functions/bc/bccomp.js

php.js offers community built php functions in javascript

function bccomp(left_operand, right_operand, scale) {
  // From: http://phpjs.org/functions
  // +   original by: lmeyrick (https://sourceforge.net/projects/bcmath-js/)
  // -    depends on: _phpjs_shared_bc
  // *     example 1: bccomp(1, 2);
  // *     returns 1: 3
  //  @todo: implement these testcases
  //        bcscale(0);
  //
  //        bcmath.test.result('bccomp', 1, -1, bccomp('-1','5', 4));
  //        bcmath.test.result('bccomp', 2, -1, bccomp('1928372132132819737213', '8728932001983192837219398127471'));
  //        bcmath.test.result('bccomp', 3,  0, bccomp('1.00000000000000000001', '1', 2));
  //        bcmath.test.result('bccomp', 4,  1, bccomp('97321', '2321'));
  var libbcmath = this._phpjs_shared_bc();

  var first, second; //bc_num
  if (typeof scale === 'undefined') {
    scale = libbcmath.scale;
  }
  scale = ((scale < 0) ? 0 : scale);

  first = libbcmath.bc_init_num();
  second = libbcmath.bc_init_num();

  first = libbcmath.bc_str2num(left_operand.toString(), scale); // note bc_ not php_str2num
  second = libbcmath.bc_str2num(right_operand.toString(), scale); // note bc_ not php_str2num
  return libbcmath.bc_compare(first, second, scale);
}