https://github.com/naridal/javasetmap.ts

Java-style Set and Map collections (on `{ hashCode(): int, equals(x: any): boolean}` objects) written in TypeScript.
https://github.com/naridal/javasetmap.ts

javascript map set typescript

Last synced: 26 days ago
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Java-style Set and Map collections (on `{ hashCode(): int, equals(x: any): boolean}` objects) written in TypeScript.

• Host: GitHub
• URL: https://github.com/naridal/javasetmap.ts
• Owner: NaridaL
• License: mit
• Created: 2017-09-02T13:08:18.000Z (almost 8 years ago)
• Default Branch: master
• Last Pushed: 2022-02-11T00:21:59.000Z (over 3 years ago)
• Last Synced: 2025-06-09T08:55:40.521Z (28 days ago)
• Topics: javascript, map, set, typescript
• Language: TypeScript
• Size: 94.7 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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# javasetmap.ts

Java-style Set and Map collections (on `{ hashCode(): int, equals(x: any): boolean}` objects) written in TypeScript.

## Installation

NPM:  `npm install javasetmap.ts --save`

    

In the browser, you can include the [UMD bundle](./dist/bundle.js) in a script tag, and the module will be available under the global `javasetmap_ts` 

    

## Usage

```ts

import {JavaMap} from 'javasetmap.ts'

// node: const {JavaMap} = require('javasetmap.ts')

// browser: const {JavaMap} = nla

declare global { // remove this block if not using TypeScript

    interface Array extends Equalable {}

    interface Number extends Equalable {}

}

Array.prototype.equals = function (o) { 

    return this == o || this.length == o.length && this.every((el, i) => el.equals(o[i])) 

}

Array.prototype.hashCode = function () { 

    return this.reduce((acc, current) => acc * 31 + current.hashCode(), 0) 

}

Number.prototype.equals = function (o) { return this == o }

Number.prototype.hashCode = function () { return this | 0 }

const myMap = new JavaMap<[number, number], string>() // new JavaMap() if not using TypeScript

myMap.set([1, 2], "foo")

myMap.has([1, 2]) // === true

myMap.get([1, 2]) // === "foo"

myMap.has([1, 3]) // === false

myMap.get([2, 1]) // === undefined

```

LICENSE

MIT