143 lines
2.1 KiB
JavaScript
143 lines
2.1 KiB
JavaScript
/*!
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* map.js - hash table for bcoin
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* Copyright (c) 2014-2016, Christopher Jeffrey (MIT License).
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* https://github.com/bcoin-org/bcoin
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*/
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'use strict';
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var assert = require('assert');
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/**
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* Map
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* @constructor
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*/
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function Map() {
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if (!(this instanceof Map))
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return new Map();
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this.map = Object.create(null);
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this.size = 0;
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}
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/**
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* Get map keys.
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* @returns {String[]}
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*/
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Map.prototype.keys = function keys() {
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return Object.keys(this.map);
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};
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/**
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* Get map values.
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* @returns {Object[]}
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*/
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Map.prototype.values = function values() {
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var keys = Object.keys(this.map);
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var values = [];
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var i, key;
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for (i = 0; i < keys.length; i++) {
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key = keys[i];
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values.push(this.map[key]);
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}
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return values;
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};
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/**
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* Get item from map.
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* @param {String} key
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* @returns {Object|null}
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*/
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Map.prototype.get = function get(key) {
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if (key === '__proto__')
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return;
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return this.map[key];
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};
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/**
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* Test whether map has an item.
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* @param {String} key
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* @returns {Boolean}
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*/
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Map.prototype.has = function has(key) {
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if (key === '__proto__')
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return false;
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return this.map[key] !== undefined;
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};
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/**
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* Set a key to value in map.
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* @param {String} key
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* @param {Object} value
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* @returns {Boolean}
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*/
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Map.prototype.set = function set(key, value) {
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var item = this.map[key];
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assert(value !== undefined);
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if (key === '__proto__')
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return;
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this.map[key] = value;
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if (item === undefined) {
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this.size++;
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return true;
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}
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return false;
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};
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/**
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* Remove an item from map.
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* @param {String} key
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* @returns {Object|null}
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*/
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Map.prototype.remove = function remove(key) {
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var item = this.map[key];
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if (item === undefined)
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return;
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delete this.map[key];
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this.size--;
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return item;
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};
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/**
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* Reset the map.
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*/
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Map.prototype.reset = function reset() {
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this.map = Object.create(null);
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this.size = 0;
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};
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/**
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* Insert a key.
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* Equivalent to `this.set([key], true)`.
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* @param {String} key
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* @returns {Boolean}
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*/
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Map.prototype.insert = function insert(key) {
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return this.set(key, true);
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};
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/*
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* Expose
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*/
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module.exports = Map;
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