HAS returns the value stored by the given key.

KEEP_KEYS returns a new object with only given keys.

KEYS returns string array of object's keys @param {Object} obj - The object whose keys you want to extract @param {Boolean} [sort=False] - If sort is true, then the returned keys will be sorted.

MERGE merge the given objects into a single object.

MERGE_RECURSIVE recursively merge the given objects into a single object.

VALUES return the attribute values of the object as an array.

ZIP returns an object assembled from the separate parameters keys and values.