indexBy_.indexBy(list, iteratee, [context]) Given a list, and an iteratee function that returns a key for each element

pairs_.pairs(object) Convert an object into a list of [key, value] pairs.

partial_.partial(function, *arguments) Partially apply a function by filling in any number of its arguments, without

initial_.initial(array, [n]) Returns everything but the last entry of the array. Especially useful on the arguments object. Pass

tap_.tap(object, interceptor) Invokes interceptor with the object, and then returns object. The primary purpose

reduceRight_.reduceRight(list, iteratee, memo, [context]) Alias: foldr The right-associative version

reduce_.reduce(list, iteratee, [memo], [context]) Aliases: inject, foldl Also known as inject

isString_.isString(object) Returns true if object is a String.

groupBy_.groupBy(list, iteratee, [context]) Splits a collection into sets, grouped by the result of running each value through iteratee

isUndefined_.isUndefined(value) Returns true if value is undefined.