Serializable is-equal

is-equal.js

export default function isEqual(x, y) {
  // Handles primitives and exact object matches
  if (x === y) {
    return true;
  }

  // We can only handle comparing "regular" objects and
  // arrays; everything else is considered not equal.
  else if (
    ((x && x.constructor === Object) || Array.isArray(x)) &&
    ((y && y.constructor === Object) || Array.isArray(y))
  ) {
    
    // If there aren't the same number of keys, then they are not equal.
    if (Object.keys(x).length !== Object.keys(y).length) {
      return false;
    }

    // If there are the same number of keys, then we just need to iterate
    // a single time to compare each key.
    for (var prop in x) {
      if (y.hasOwnProperty(prop)) {
        if (!isEqual(x[prop], y[prop])) {
          return false;
        }
      } else {
        return false;
      }
    }

    return true;
  } else {
    return false;
  }
}