> For the complete documentation index, see [llms.txt](https://www.lisppad.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.lisppad.app/libraries/srfi.md).

# SRFI

These are the [SRFI](https://srfi.schemers.org) libraries supported by LispKit and thus are included in LispPad and LispPad Go:

* [SRFI 1: List Library](https://srfi.schemers.org/srfi-1/srfi-1.html)
* [SRFI 2: AND-LET\* - an AND with local bindings, a guarded LET\* special form](https://srfi.schemers.org/srfi-2/srfi-2.html)
* [SRFI 6: Basic String Ports](https://srfi.schemers.org/srfi-6/srfi-6.html)
* [SRFI 8: receive - Binding to multiple values](https://srfi.schemers.org/srfi-8/srfi-8.html)
* [SRFI 9: Defining Record Types](https://srfi.schemers.org/srfi-9/srfi-9.html)
* [SRFI 11: Syntax for receiving multiple values](https://srfi.schemers.org/srfi-11/srfi-11.html)
* [SRFI 14: Character-set library](https://srfi.schemers.org/srfi-14/srfi-14.html)
* [SRFI 16: Syntax for procedures of variable arity](https://srfi.schemers.org/srfi-16/srfi-16.html)
* [SRFI 17: Generalized set!](https://srfi.schemers.org/srfi-17/srfi-17.html)
* [SRFI 18: Multithreading support](https://srfi.schemers.org/srfi-18/srfi-18.html)
* [SRFI 19: Time Data Types and Procedures](https://srfi.schemers.org/srfi-19/srfi-19.html)
* [SRFI 23: Error reporting mechanism](https://srfi.schemers.org/srfi-23/srfi-23.html)
* [SRFI 26: Notation for Specializing Parameters without Currying](https://srfi.schemers.org/srfi-26/srfi-26.html)
* [SRFI 27: Sources of Random Bits](https://srfi.schemers.org/srfi-27/srfi-27.html)
* [SRFI 28: Basic Format Strings](https://srfi.schemers.org/srfi-28/srfi-28.html)
* [SRFI 31: A special form rec for recursive evaluation](https://srfi.schemers.org/srfi-31/srfi-31.html)
* [SRFI 33: Integer Bitwise-operation Library](https://srfi.schemers.org/srfi-33/srfi-33.html)
* [SRFI 34: Exception Handling for Programs](https://srfi.schemers.org/srfi-34/srfi-34.html)
* [SRFI 35: Conditions](https://srfi.schemers.org/srfi-35/srfi-35.html)
* [SRFI 39: Parameter objects](https://srfi.schemers.org/srfi-39/srfi-39.html)
* [SRFI 41: Streams](https://srfi.schemers.org/srfi-41/srfi-41.html)
* [SRFI 46: Basic Syntax-rules Extensions](https://srfi.schemers.org/srfi-46/srfi-46.html)
* [SRFI 48: Intermediate Format Strings](https://srfi.schemers.org/srfi-48/srfi-48.html)
* [SRFI 51: Handling rest list](https://srfi.schemers.org/srfi-51/srfi-51.html)
* [SRFI 54: Formatting](https://srfi.schemers.org/srfi-54/srfi-54.html)
* [SRFI 55: require-extension](https://srfi.schemers.org/srfi-55/srfi-55.html)
* [SRFI 63: Homogeneous and Heterogeneous Arrays](https://srfi.schemers.org/srfi-63/srfi-63.html)
* [SRFI 64: A Scheme API for test suites](https://srfi.schemers.org/srfi-64/srfi-64.html)
* [SRFI 69: Basic hash tables](https://srfi.schemers.org/srfi-69/srfi-69.html)
* [SRFI 87: `=>` in case clauses](https://srfi.schemers.org/srfi-87/srfi-87.html)
* [SRFI 95: Sorting and Merging](https://srfi.schemers.org/srfi-95/srfi-95.html)
* [SRFI 98: An interface to access environment variables](https://srfi.schemers.org/srfi-98/srfi-98.html)
* [SRFI 101: Purely Functional Random-Access Pairs and Lists](https://srfi.schemers.org/srfi-101/srfi-101.html)
* [SRFI 102: Procedure Arity Inspection](https://srfi.schemers.org/srfi-102/srfi-102.html)
* [SRFI 111: Boxes](https://srfi.schemers.org/srfi-111/srfi-111.html)
* [SRFI 112: Environment inquiry](https://srfi.schemers.org/srfi-112/srfi-112.html)
* [SRFI 113: Sets and bags](https://srfi.schemers.org/srfi-113/srfi-113.html)
* [SRFI 118: Simple adjustable-size strings](https://srfi.schemers.org/srfi-118/srfi-118.html)
* [SRFI 121: Generators](https://srfi.schemers.org/srfi-121/srfi-121.html)
* [SRFI 125: Intermediate hash tables](https://srfi.schemers.org/srfi-125/srfi-125.html)
* [SRFI 128: Comparators](https://srfi.schemers.org/srfi-128/srfi-128.html)
* [SRFI 129: Titlecase procedures](https://srfi.schemers.org/srfi-129/srfi-129.html)
* [SRFI 132: Sort Libraries](https://srfi.schemers.org/srfi-132/srfi-132.html)
* [SRFI 133: Vector Library](https://srfi.schemers.org/srfi-133/srfi-133.html)
* [SRFI 134: Immutable Deques](https://srfi.schemers.org/srfi-134/srfi-134.html)
* [SRFI 135: Immutable Texts](https://srfi.schemers.org/srfi-135/srfi-135.html)
* [SRFI 137: Minimal Unique Types](https://srfi.schemers.org/srfi-137/srfi-137.html)
* [SRFI 141: Integer division](https://srfi.schemers.org/srfi-141/srfi-141.html)
* [SRFI 142: Bitwise Operations](https://srfi.schemers.org/srfi-142/srfi-142.html)
* [SRFI 143: Fixnums](https://srfi.schemers.org/srfi-143/srfi-143.html)
* [SRFI 144: Flonums](https://srfi.schemers.org/srfi-144/srfi-144.html)
* [SRFI 145: Assumptions](https://srfi.schemers.org/srfi-145/srfi-145.html)
* [SRFI 146: Mappings](https://srfi.schemers.org/srfi-146/srfi-146.html)
* [SRFI 149: Basic syntax-rules Template Extensions](https://srfi.schemers.org/srfi-149/srfi-149.html)
* [SRFI 151: Bitwise Operations](https://srfi.schemers.org/srfi-151/srfi-151.html)
* [SRFI 152: String Library](https://srfi.schemers.org/srfi-152/srfi-152.html)
* [SRFI 154: First-class dynamic extents](https://srfi.schemers.org/srfi-154/srfi-154.html)
* [SRFI 155: Promises](https://srfi.schemers.org/srfi-155/srfi-155.html)
* [SRFI 158: Generators and Accumulators](https://srfi.schemers.org/srfi-158/srfi-158.html)
* [SRFI 161: Unifiable Boxes](https://srfi.schemers.org/srfi-161/srfi-161.html)
* [SRFI 162: Comparators sublibrary](https://srfi.schemers.org/srfi-162/srfi-162.html)
* [SRFI 165: The Environment Monad](https://srfi.schemers.org/srfi-165/srfi-165.html)
* [SRFI 166: Monadic Formatting](https://srfi.schemers.org/srfi-166/srfi-166.html)
* [SRFI 167: Ordered Key Value Store](https://srfi.schemers.org/srfi-167/srfi-167.html)
* [SRFI 173: Hooks](https://srfi.schemers.org/srfi-173/srfi-173.html)
* [SRFI 174: POSIX Timespecs](https://srfi.schemers.org/srfi-174/srfi-174.html)
* [SRFI 175: ASCII Character Library](https://srfi.schemers.org/srfi-175/srfi-175.html)
* [SRFI 177: Portable keyword arguments](https://srfi.schemers.org/srfi-177/srfi-177.html)
* [SRFI 180: JSON](https://srfi.schemers.org/srfi-180/srfi-180.html)
* [SRFI 189: Maybe and Either: optional container types](https://srfi.schemers.org/srfi-189/srfi-189.html)
* [SRFI 194: Random data generators](https://srfi.schemers.org/srfi-194/srfi-194.html)
* [SRFI 195: Multiple-value boxes](https://srfi.schemers.org/srfi-195/srfi-195.html)
* [SRFI 196: Range Objects](https://srfi.schemers.org/srfi-196/srfi-196.html)
* [SRFI 204: Wright-Cartwright-Shinn pattern matcher](https://srfi.schemers.org/srfi-204/srfi-204.html)
* [SRFI 208: NaN procedures](https://srfi.schemers.org/srfi-208/srfi-208.html)
* [SRFI 209: Enums and Enum Sets](https://srfi.schemers.org/srfi-209/srfi-209.html)
* [SRFI 210: Procedures and Syntax for Multiple Values](https://srfi.schemers.org/srfi-210/srfi-210.html)
* [SRFI 214: Flexvectors](https://srfi.schemers.org/srfi-214/srfi-214.html)
* [SRFI 215: Central log exchange](https://srfi.schemers.org/srfi-215/srfi-215.html)
* [SRFI 216: SICP Prerequisites](https://srfi.schemers.org/srfi-216/srfi-216.html)
* [SRFI 217: Integer sets](https://srfi.schemers.org/srfi-217/srfi-217.html)
* [SRFI 219: Define higher-order lambda](https://srfi.schemers.org/srfi-219/srfi-219.html)
* [SRFI 221: Generator/accumulator sub-library](https://srfi.schemers.org/srfi-221/srfi-221.html)
* [SRFI 222: Compound objects](https://srfi.schemers.org/srfi-222/srfi-222.html)
* [SRFI 223: Generalized binary search procedures](https://srfi.schemers.org/srfi-223/srfi-223.html)
* [SRFI 224: Integer mappings](https://srfi.schemers.org/srfi-224/srfi-224.html)
* [SRFI 227: Optional Arguments](https://srfi.schemers.org/srfi-227/srfi-227.html)
* [SRFI 228: Composing Comparators](https://srfi.schemers.org/srfi-228/srfi-228.html)
* [SRFI 229: Tagged procedures](https://srfi.schemers.org/srfi-229/srfi-229.html)
* [SRFI 230: Atomic Operations](https://srfi.schemers.org/srfi-230/srfi-230.html)
* [SRFI 232: Flexible curried procedures](https://srfi.schemers.org/srfi-232/srfi-232.html)
* [SRFI 233: INI files](https://srfi.schemers.org/srfi-233/srfi-233.html)
* [SRFI 236: Evaluating expressions in an unspecified order](https://srfi.schemers.org/srfi-236/srfi-236.html)