databridge/bin/array-equals.js

Data bridging software to modularize, automate and schedule the transfer of data between different sources and destinations.

module.exports = function(a, b) {
  // if the other array is a falsy value, return
  if (!b)
    return false;

  // compare lengths - can save a lot of time
  if (a.length != b.length)
    return false;

  //check if both are arrays
  if (!(a instanceof Array) || !(b instanceof Array)) return false;

  for (var i = 0, l = a.length; i < l; i++) {
    // Check if we have nested arrays
    if (a[i] instanceof Array && b[i] instanceof Array) {
      // recurse into the nested arrays
      if (!a[i].equals(b[i]))
        return false;
    } else if (a[i] != b[i]) {
      // Warning - two different object instances will never be equal: {x:20} != {x:20}
      return false;
    }
  }
  return true;
};