SLN Function

SLN.js

// Copyright (c) 2012 Sutoiku, Inc. (MIT License)

function SLN(cost, salvage, life) {
  // Return error if any of the parameters is not a number
  if (isNaN(cost) || isNaN(salvage) || isNaN(life)) return '#VALUE!';

  // Return error if life equal to 0 (zero)
  if (life === 0) return '#NUM!';
  
  // Return straight-line depreciation
  return (cost - salvage) / life;
}