Underscore.ObjC
Underscore.ObjC is a utility-belt library for Objective-C that provides a lot of the functional programming support that you would expect in languages like Ruby, but without extending any of the built-in Foundation classes. It is heavily inspired by Underscore.js and aims to emulate the original syntax as closely as possible within language limitations.
Underscore.ObjC requires Mac OS X 10.6+ / iOS 4.0+, due to the heavy use of blocks. You may be able to compile and use the library on Mac OS X 10.5+ / iOS 3.0+ with the help of PLBlocks, but I have not tested that myself.
WORK IN PROGRESS
✓ : Implemented × : Unimplemented
Macros
✓ a_ = ✓ arr_
✓ ma_ = ✓ marr_
✓ s_ = ✓ str_
✓ ms_ = ✓ mstr_
✓ d_ = ✓ dict_
✓ md_ = ✓ mdict_
✓ kv_
✓ $_ = ✓ str_
✓ m$_ = ✓ mstr_
✓ bool_
✓ int_
✓ float_
✓ char_
✓ double_
✓ integer_
✓ long_
✓ longlong_ = ✓ longLong_
✓ short_
✓ uchar_ = ✓ unsignedChar_
✓ uint_ = ✓ unsignedInt_
✓ uinteger_ = ✓ unsignedInteger_
✓ ulong_ = ✓ unsignedLong_
✓ ulonglong_ = ✓ unsignedLongLong_
✓ ushort_ = ✓ unsignedShort_
✓ nonretained_ = ✓ nonretainedObject_
✓ pointer_
✓ point_
✓ range_
✓ rect_
✓ size_
Collections (Arrays, Sets, Dictionaries)
✓ each = × forEach
✓ map = × collect
✓ reduce = × inject = × foldl
× reduceRight = × foldr
× find = × detect
× filter = × select
× reject
× all = × every
× any = × some
× include = × contains
× pluck
× max
× min
× sortBy
× groupBy
× sortedIndex
× shuffle
× toArray
✓ size
Arrays
✓ first = × head
✓ firstN
✓ initial
✓ initialN
✓ last
✓ lastN
✓ rest = × tail
✓ restN
✓ compact
✓ flatten
× union
× intersection
× difference
× uniq = × unique
× zip
× indexOf
× lastIndexOf
× range
× slice
× push
× pop
× shift
× unshift
× join
Sets
× rest
× compact
× flatten
× without
× union
× intersection
× difference
Dictionaries
× keys
× values
× extend
× defaults
× clone
Objects
× tap
× isEqual
× isEmpty
× isArray
× isString
× isNumber
× isDate
× isNull
Utility
× identity
✓ times
× uniqueId
× escape
Chaining
✓ chain
✓ value
✓ boolValue
✓ charValue
✓ doubleValue
✓ floatValue
✓ intValue
✓ integerValue
✓ longlongValue = ✓ longLongValue
✓ longValue
✓ shortValue
✓ ucharValue = ✓ unsignedCharValue
✓ uintegerValue = ✓ unsignedIntegerValue
✓ uintValue = ✓ unsignedIntValue
✓ ulonglongValue = ✓ unsignedLongLongValue
✓ ulongValue = ✓ unsignedLongValue
✓ ushortValue = ✓ unsignedShortValue
CREDITS
Thanks to Jeremy Ashkenas and all contributors to Underscore.js.
AUTHOR & LICENSE
Copyright (c) 2012 Peter Jihoon Kim. This software is licensed under the MIT License.