A lisp implementation in Typescript. Could be used in browser, node.js or as a CLI.

REPL

Documentation

mojir.github.io/lits

Install

npm i -g lits-parser

Repl usage

Start the lits REPL in a terminal by enter lits

• Tab completion
• History stored on file

$ lits
Type "`help" for more information.
LITS> (+ 7 4)
11
LITS> (let ((day (* 24 60 60 1000))) (* 7 day)) ; Ever wondered how many milliseconds there are in a week?
604800000

$ lits --help
Usage: lits [options]

Options:
  -g ...                          Global variables as a JSON string
  -G ...                          Global variables file (.json file)
  -f ...                          .lits file
  -e ...                          Lits expression
  -h, --help                      Show this help
  -h, --help <builtin function>   Show help for <builtin function>
  -v, --version                   Print lits version

$ lits -e "(/ 81 9)"
9

API

Install api

npm i lits-parser

How to use?

import { Lits } from 'lits-parser'

const lits = new Lits()
lits.run('(+ 1 2 3 4)'); // returns 10

Builtin Functions

Special functions

• and
• cond
• def
• defn
• defns
• defs
• do
• fn
• for
• if
• if-let
• if-not
• let
• loop
• or
• recur
• throw
• time!
• try
• when
• when-first
• when-let
• when-not

Normal functions

Predicate

• array?
• boolean?
• coll?
• even?
• false?
• finite?
• function?
• integer?
• nan?
• neg?
• negative-infinity?
• nil?
• number?
• object?
• odd?
• pos?
• positive-infinity?
• regexp?
• seq?
• string?
• true?
• zero?

Sequence

• cons
• distinct
• drop
• drop-last
• drop-while
• filter
• first
• frequencies
• group-by
• index-of
• join
• last
• map
• next
• nth
• nthnext
• nthrest
• partition
• partition-all
• partition-by
• pop
• position
• push
• rand-nth!
• random-sample!
• reduce
• reduce-right
• reductions
• remove
• rest
• reverse
• second
• shift
• shuffle
• slice
• some
• sort
• sort-by
• split-at
• split-with
• take
• take-last
• take-while
• unshift

Collection

• any?
• assoc
• assoc-in
• concat
• contains?
• count
• empty?
• every?
• get
• get-in
• has?
• has-every?
• has-some?
• not-any?
• not-empty
• not-empty?
• not-every?
• update
• update-in
• Array
• array
• flatten
• mapcat
• range
• repeat

Object

• dissoc
• entries
• find
• keys
• merge
• merge-with
• object
• select-keys
• vals
• zipmap

String

• from-char-code
• lower-case
• number
• number-to-string
• pad-left
• pad-right
• split
• str
• string-repeat
• subs
• template
• to-char-code
• trim
• trim-left
• trim-right
• upper-case

Math

• *
• +
• −
• /
• abs
• acos
• acosh
• asin
• asinh
• atan
• atanh
• cbrt
• ceil
• cos
• cosh
• dec
• e
• epsilon
• exp
• floor
• inc
• log
• log10
• log2
• max
• max-safe-integer
• max-value
• min
• min-safe-integer
• min-value
• mod
• nan
• negative-infinity
• pi
• positive-infinity
• pow
• quot
• rand!
• rand-int!
• rem
• round
• sign
• sin
• sinh
• sqrt
• tan
• tanh
• trunc

Functional

• apply
• comp
• complement
• constantly
• every-pred
• fnil
• identity
• juxt
• partial
• some-pred

Regular expression

• match
• regexp
• replace

Bitwise

• bit-and
• bit-and-not
• bit-clear
• bit-flip
• bit-not
• bit-or
• bit-set
• bit-shift-left
• bit-shift-right
• bit-test
• bit-xor

Misc

• <
• <=
• =
• >
• >=
• assert
• boolean
• compare
• debug!
• equal?
• inst-ms
• lits-version
• not
• not=
• write!