compareObj.js

module.exports = {

  testIfArray: function (arr) {
    return !!arr && Array.isArray(arr);
  },

  testIfObject: function (obj) {
    return !this.testIfArray(obj) && typeof obj === 'object';
  },

  compareObj: function (obj1, obj2, filterKeys) {
    var isArray = false, isObject = false;

    if (this.testIfArray(obj1) && this.testIfArray(obj2)) {
      isArray = true;
    }

    if (this.testIfObject(obj1) && this.testIfObject(obj2)) {
      isObject = true;
    }

    if (!isArray && !isObject && obj1 !== obj2) {
      return false;
    }

    // Array testing
    if (isArray) {
      if (obj1.length !== obj2.length)
        return false;

      for (var i = 0; i < obj1.length; i++) {
        if (!this.compareObj(obj1[i], obj2[i], filterKeys)) {
          return false;
        }
      }
    }

    // Object testing
    if (isObject) {
      var keysObj1 = Object.keys(obj1);
      var keysObj2 = Object.keys(obj2);

      if (this.testIfArray(filterKeys)) {
        function checkKey(el) {
          return filterKeys.indexOf(el) === -1;
        }

        keysObj1 = keysObj1.filter(checkKey);
        keysObj2 = keysObj2.filter(checkKey);
      }

      if (keysObj1.length !== keysObj2.length && !this.compareObj(keysObj1, keysObj2, filterKeys)) {
        // if the array of object keys do not match than return
        return false;
      }

      for (var i = 0; i < keysObj1.length; i++) {
        var key = keysObj1[i];

        if (this.testIfArray(filterKeys) && filterKeys.indexOf(key) !== -1) {
          // don't mind the values that need to be filtered out
          break;
        }

        if (!this.compareObj(obj1[key], obj2[key], filterKeys)) {
          return false;
        }
      }
    }

    return true;
  }
};