Javascript Trie

trie.js

class CharNode {
    _char;
    _phonetics = new Set();
    _nextCharsLevel = {};

    constructor(char) {
        this._char = char;
    }

    get phoneticsLength() {
        return this._phonetics.length;
    }

    get char() {
        return this._char;
    }

    get phonetics() {
        return this._phonetics;
    }

    get nextCharsLevel() {
        return this._nextCharsLevel;
    }

    addPhonetic(phonetic) {
        this._phonetics.add(phonetic);
    }
}

class Trie {
    _firstCharsLevel = {};

    constructor() {}

    addWord(word, phonetic) {
        const charsArr = word.split('');
        let currentCharLevel = this._firstCharsLevel;
        let currentCharNode;
        let currentChar = charsArr.shift();
        while(charsArr.length) {
            if(currentChar in currentCharLevel) {
                currentCharNode = currentCharLevel[currentChar];
                currentCharLevel = currentCharLevel[currentChar].nextCharsLevel;
                currentChar = charsArr.shift();
                continue;
            }
            currentCharLevel[currentChar] = new CharNode(currentChar);
            currentCharNode = currentCharLevel[currentChar];
            currentCharLevel = currentCharLevel[currentChar].nextCharsLevel;
            currentChar = charsArr.shift();
        }
        currentCharNode.addPhonetic(phonetic);
    }

    findWord(word) {
        const charsArr = word.split('');
        let currentCharLevel = this._firstCharsLevel;
        let currentChar;
        let currentCharNode;
        do {
            currentChar = charsArr.shift();
            if(!charsArr.length) return currentCharNode.phonetics;
            if(!(currentChar in currentCharLevel)) return null;
            currentCharNode = currentCharLevel[currentChar];
            currentCharLevel = currentCharNode.nextCharsLevel;
        } while(charsArr.length);
        return null;
    }
}

const trie = new Trie();

trie.addWord('à bout de', `/abudə/`);
trie.addWord('à bout portant', `/abupɔʁtɑ̃/`);
trie.addWord('à bras ouverts', `/abʁazuvɛʁ/`);
trie.addWord('a capella', `/akapela/`);
trie.addWord('à ce compte', `/asəkɔ̃t/`);
trie.addWord('à ce compte-là', `/asəkɔ̃tla/`);
trie.addWord('à ce moment-là', `/asəmɔmɑ̃la/`);
trie.addWord('à ce point', `/asəpwɛ̃/`);
console.log(trie.findWord('à bout de'));
console.log(trie.findWord('à bout portant'));
console.log(trie.findWord('a capella'));
console.log(trie.findWord('à ce compte'));
console.log(trie.findWord('à ce compte-là'));
console.log(trie.findWord('à ce moment-là'));
console.log(trie.findWord('à ce point'));
console.log(trie.findWord('hello'));