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Commit19105e2

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Hash Table data structure
A hash table is a data structure used to implement an associativearray, that can map keys to values. A hash table uses a hash functionto compute an index into an array of buckets or slots, from which thecorrect value can be found. The idea is to access a value in O(1).
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‎src/data-structures/hash-table.js

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/**
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* Hash Table
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*
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* An associative array, that can map keys
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* (strings and numbers) to values in O(1).
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*
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*@example
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* var hash = require('path-to-algorithms/src/data-structures'+
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* '/hash-table');
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* var HashTable = new hash.HashTable();
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*
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* HashTable.put(10, 'value');
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* HashTable.put('key', 10);
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*
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* console.log(HashTable.get(10)); // 'value'
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* console.log(HashTable.get('key')); // 10
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*
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* HashTable.remove(10);
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* HashTable.remove('key');
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*
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* console.log(HashTable.get(10)); // 'undefined'
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* console.log(HashTable.get('key')); // 'undefined'
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*
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*@module data-structures/hash-table
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*/
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(function(exports){
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'use strict';
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exports.HashTable=function(){
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this.elements=[];
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};
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exports.HashTable.prototype.hashCode=function(str){
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vari;
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varhashCode=0;
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varcharacter;
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if(str.length===0){
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returnhashCode;
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}
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for(i=0;i<str.length;i+=1){
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character=str.charCodeAt(i);
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hashCode=((hashCode<<5)-hashCode)+character;
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hashCode=hashCode&hashCode;
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}
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returnhashCode;
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};
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exports.HashTable.prototype.put=function(key,value){
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varhashCode=this.hashCode(key);
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this.elements[hashCode]=value;
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};
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exports.HashTable.prototype.get=function(key){
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varhashCode=this.hashCode(key);
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returnthis.elements[hashCode];
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};
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exports.HashTable.prototype.remove=function(key){
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varhashCode=this.hashCode(key);
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this.elements.splice(hashCode,1);
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};
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})(typeofwindow==='undefined' ?module.exports :window);

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