advanced-map-altered-equal/index.js

Map-like class with customizable equality operator

"use strict";
const tslib_1 = require("tslib");
const advanced_map_base_1 = tslib_1.__importDefault(require("advanced-map-base"));
/**
 * This class allows one to alter equality comparision
 */
class AlteredEqual extends advanced_map_base_1.default {
    /**
     * @param Map A constructor (a.k.a class) that creates an iterable Map-like object
     * @param equal Function that compares keys, default to `Object.is`
     */
    constructor(Map, equal = Object.is) {
        super(Map);
        this.equal = equal;
    }
    find(key) {
        const { equal } = this;
        for (const [k, v] of this.data) {
            if (equal(key, k)) {
                return {
                    found: true,
                    value: {
                        key: k,
                        value: v
                    }
                };
            }
        }
        return {
            found: false
        };
    }
    has(key) {
        return this.find(key).found;
    }
    get(key) {
        const res = this.find(key);
        return res.found ? res.value.value : undefined;
    }
    set(key, value) {
        const res = this.find(key);
        this.data.set(res.found ? res.value.key : key, value);
        return this;
    }
    delete(key) {
        const res = this.find(key);
        if (res.found) {
            this.data.delete(res.value.key);
            return true;
        }
        return false;
    }
}
module.exports = AlteredEqual;
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