unescape_.unescape(string) The opposite of escape

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

isNumber_.isNumber(object) Returns true if object is a Number (including NaN).

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

isBoolean_.isBoolean(object) Returns true if object is either true or false.

has_.has(object, key) Does the object contain the given key? Identical to object.hasOwnProperty(key), but uses a safe reference

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

indexOf_.indexOf(array, value, [isSorted]) Returns the index at which value can be found in the array, or -1

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

findKey_.findKey(object, predicate, [context]) Similar to _