isEmpty_.isEmpty(object) Returns true if an enumerable object contains no values (no enumerable own-properties). For

isArguments_.isArguments(object) Returns true if object is an Arguments object.

extend_.extend(destination, *sources) Copy all of the properties in the source objects over to the destination

pick_.pick(object, *keys) Return a copy of the object, filtered to only have values for the whitelisted keys (or array

property_.property(key) Returns a function that will itself return the key property of any passed-in object.

propertyOf_.propertyOf(object) Inverse of _.property. Takes an object and returns a function which will return the value

extendOwn_.extendOwn(destination, *sources) Alias: assign Like extend, but only copies own

isDate_.isDate(object) Returns true if object is a Date.

isEqual_.isEqual(object, other) Performs an optimized deep comparison between the two objects, to determine if they should be considered

isRegExp_.isRegExp(object) Returns true if object is a RegExp.