Kotlin Stdlib API in Typescript

Porting the Kotlin standard library design rationale to typescript. Boost the productivity by using the wise API design.

(WIP: This project is under active development. You are welcome to contribute.)

Getting Started to Contribute

Pick the not-yet-implemented API(below list) and try to create a GitHub issues with the feature template. There is a full check-list for you to contribute this project :). Here is the example.

Getting Started

This module designed to be used in Typescript environment for utilizing strict type-checking and IDE auto-complete experience that similar to Kotlin Development.

If your want to use it in javascript project, I highly recommend you to use a relatively new VSCode feature @ts-check Or Intellij-based IDE to enable type checking.

npm install kt.ts

# OR

yarn add kt.ts

Typescript project

// index.ts
import 'kt.ts'

// `flatMap` require { "lib": ["es2019"] } in tsconfig.json
const result = [1,2,[3,3]].flatMap(it => it).distinct()

console.log(result)

NodeJs CommonJS style

// index.js
require('kt.ts')

// node >= 11.0 support `flatMap`
const result = [1,2,[3,3]].flatMap(it => it).distinct()

console.log(result)

Project Status

Kotlin List API

• contains
• elementAt
• elementAtOrElse
• elementAtOrNull
• find
• findLast
• first
• first
• firstOrNull
• firstOrNull
• getOrElse
• getOrNull
• indexOf
• indexOfFirst
• indexOfLast
• last
• last
• lastIndexOf
• lastOrNull
• random
• single
• single
• singleOrNull
• singleOrNull
• drop
• dropLast
• dropLastWhile
• dropWhile
• filter
• filterIndexed
• filterNot
• filterNotNull
• slice
• take
• takeLast
• takeLastWhile
• takeWhile
• reverse
• reversed
• sortBy
• sortByDescending
• sortDescending
• sorted
• sortedBy
• sortedByDescending
• sortedDescending
• sortedWith
• associate
• associateBy
• associateBy
• associateWith
• toSet
• groupBy
• groupBy
• mapIndexed
• mapIndexedNotNull
• mapNotNull
• withIndex
• distinct
• distinctBy
• intersect
• subtract
• union
• all
• any
• any
• count
• count
• fold
• foldIndexed
• foldRight
• foldRightIndexed
• forEach
• forEachIndexed
• max
• maxBy
• maxWith
• min
• minBy
• minWith
• none
• none
• onEach
• reduce
• reduceIndexed
• reduceRight
• reduceRightIndexed
• sumBy
• requireNoNulls
• requireNoNulls
• chunked
• chunked
• minus
• minus
• minusElement
• partition
• plus
• plus
• plusElement
• windowed
• windowed
• zip
• zip
• zip
• zip
• zipWithNext
• zipWithNext
• joinTo
• joinToString
• average
• sum
• containsAll
• get
• isEmpty
• iterator
• subList
• size
• lastIndex

Extra for TS and Kotlin-Like API

• filterNotEmpty