code: function (start, end, pos, complete) {
  		var ret = [],
  			i = start.length,
  			startVal;
  
  		if (pos === 1) { // land on the final path without adjustment points appended in the ends
  			ret = complete;
  
  		} else if (i === end.length && pos < 1) {
  			while (i--) {
  				startVal = parseFloat(start[i]);
  				ret[i] =
  					isNaN(startVal) ? // a letter instruction like M or L
  						start[i] :
  						pos * (parseFloat(end[i] - startVal)) + startVal;
  
  			}
  		} else { // if animation is finished or length not matching, land on right value
  			ret = end;
  		}
  		return ret;
  	}
docs: Interpolate each value of the path and return the array