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trie.js
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trie.js
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'use strict';
class Node {
constructor (value = null, isCompleteWord = false) {
this.value = value;
this.children = new Map();
this.isCompleteWord = isCompleteWord;
}
/**
* @param {char} value
* @param {Node} node
*/
setChild (value, node) {
this.children.set(value, node);
}
/**
* @param {char} value
* @return {Node}
*/
getChild (value) {
return this.children.get(value);
}
}
export default class Trie {
constructor () {
this.root = new Node();
}
/**
* @param {string} word
*/
addWord (word) {
if (!this.isValidWord(word)) {
throw Error('Invalid Word');
}
let current = this.root;
Array.from(word).forEach((letter) => {
if (!current.getChild(letter)) {
current.setChild(letter, new Node(letter));
}
current = current.getChild(letter);
});
current.isCompleteWord = true;
}
/**
* @return {Array<string>}
*/
getWords () {
let words = [];
const getWords = (node, wordFragment) => {
node.children.forEach((child) => {
if (child.isCompleteWord) {
words.push(wordFragment + child.value);
}
getWords(child, wordFragment + child.value);
});
};
getWords(this.root, '');
return words;
}
/**
* @param {string} word
* @return {Boolean}
*/
hasWord (word) {
let current = this.root;
Array.from(word).forEach((letter) => {
if (!current.getChild(letter)) {
return false;
}
current = current.getChild(letter);
});
return current.isCompleteWord;
}
/**
* @param {string} prefix
* @return {Node}
*/
find (prefix) {
if (!this.isValidWord(prefix)) {
throw Error('Invalid Word');
}
let current = this.root;
Array.from(prefix).forEach((letter) => {
if (!current.getChild(letter)) {
return null;
}
current = current.getChild(letter);
});
return current.value === null ? null : current;
}
/**
* @param {string} word
* @return {Boolean}
*/
isValidWord (word) {
return (typeof (word) === 'string' || word instanceof String) && word.match(/^[A-z]+$/);
}
}