ELOQUENT JAVASCRIPT exercise - The sum of a range

qjs

(function () {
/*  
  console.log(sum(range(1, 10)));
  -> 55
  console.log(range(5, 2, -1));
  -> [5,4,3,2]
*/
  function range (param1, param2, param3) {
    /*
    1. if param1 >= param2 then -param3 else return false
    2. if param1 <= param2 then +param3 else return false    
    */

    var arrTemp = [];

    //check number of an argument
    if (typeof param1 == 'number' && 
        typeof param2 == 'number' && 
        typeof param2 == 'number') {
      if (param1 >= param2) {
        if ((arguments.length == 3) && (param3 < 0)) {
          for (param1; param1 >= param2; param1 -= Math.abs(param3)) {
            arrTemp.push(param1);
          }          
        } else if (arguments.length == 2) {
          for (param1; param1 >= param2; param1--) {
            arrTemp.push(param1);     
          }     
        }
        return arrTemp;
      } else if (param1 <= param2) {
        if ((arguments.length == 3) && (param3 > 0)) {
          for (param1; param1 <= param2; param1 += Math.abs(param3)) {
            arrTemp.push(param1);
          }
        } else if (arguments.length == 2) {
          for (param1; param1 <= param2; param1++) {
            arrTemp.push(param1);            
          }
        }
        return arrTemp;
      }
    }
  } 
  // lets test it!
  console.log(range(1, 20));
})();