TypeScript Multimap

multimap.ts

export interface Multimap<K, V> {
    clear(): void
    containsKey(key: K): boolean
    containsValue(value: V): boolean
    containsEntry(key: K, value: V): boolean
    delete(key: K, value?: V): boolean
    entries: MultimapEntry<K, V>[]
    get(key: K): V[]
    keys(): K[]
    put(key: K, value: V): MultimapEntry<K, V>[]
}

export class ArrayListMultimap<K, V> implements Multimap<K, V> {

    private _entries: MultimapEntry<K, V>[] = []

    public clear(): void {
        this._entries = []
    }

    public containsKey(key: K): boolean {
        return this._entries
            .filter(entry => entry.key == key)
            .length > 0
    }

    public containsValue(value: V): boolean {
        return this._entries
            .filter(entry => entry.value == value)
            .length > 0
    }

    public containsEntry(key: K, value: V): boolean {
        return this._entries
            .filter(entry => entry.key == key && entry.value == value)
            .length > 0
    }

    public delete(key: K, value?: V): boolean {
        let temp = this._entries
        this._entries = this._entries
            .filter(entry => {
                if(value)
                    return entry.key != key || entry.value != value
                return entry.key != key
            })
        return temp.length != this._entries.length
    }

    public get entries(): MultimapEntry<K, V>[] {
        return this._entries
    }

    public get(key: K): V[] {
        return this._entries
            .filter(entry => entry.key == key)
            .map(entry => entry.value)
    }

    public keys(): K[] {
        return Array.from(new Set(this._entries.map(entry => entry.key)))
    }

    public put(key: K, value: V): MultimapEntry<K, V>[] {
        this._entries.push(new MultimapEntry(key, value))
        return this._entries
    }
}

class MultimapEntry<K, V> {
    constructor(readonly key: K, readonly value: V) {}
}

/*

MIT License

Copyright (c) 2023 Jordan Luyke

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

*/

Thank you for sharing!

😄

Hey! what the license for this? Thanks!

@pombredanne I've added MIT license

@jordanluyke Thank you ++ for this quick response