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59 lines
1.3 KiB
JavaScript
59 lines
1.3 KiB
JavaScript
// @ts-check
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const {isDeepStrictEqual} = require('util')
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/**
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* ObjectMap extends Map, but determines key equality using Node.js’ `util.isDeepStrictEqual` rather than using [SameValueZero](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map#key_equality). This makes using objects as keys a bit simpler.
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*/
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module.exports = class ObjectMap extends Map {
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#data
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constructor(iterable = []) {
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super()
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this.#data = iterable
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}
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clear() {
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this.#data = []
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}
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delete(key) {
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if (!this.has(key)) {
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return false
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}
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this.#data = this.#data.filter(([existingKey]) => !isDeepStrictEqual(existingKey, key))
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return true
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}
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entries() {
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return this.#data[Symbol.iterator]()
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}
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forEach(cb) {
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for (const [key, value] of this.#data) {
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cb(value, key, this.#data)
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}
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}
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get(key) {
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return this.#data.find(([existingKey]) => isDeepStrictEqual(existingKey, key))?.[1]
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}
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has(key) {
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return this.#data.findIndex(([existingKey]) => isDeepStrictEqual(existingKey, key)) !== -1
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}
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keys() {
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return this.#data.map(([key]) => key)[Symbol.iterator]()
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}
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set(key, value) {
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this.delete(key)
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this.#data.push([key, value])
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return this
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}
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values() {
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return this.#data.map(([, value]) => value)[Symbol.iterator]()
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}
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}
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