try.js

class Node {
    constructor(char = null) {
        this.children = {};
        this.wordsInChildren = 0;
        this.isCompleteWord = false;
        this.value = char;
    }
}

class Try {
    constructor() {
        this.root = new Node();
    }
    insert(word) {
        let node = this.root;
        for (let i = 0; i < word.length; i++) {
            let char = word[i];
            if (!node.children[char])
                node.children[char] = new Node(char);

            if (i === (word.length - 1))
                node.children[char].isCompleteWord = true;

            node.wordsInChildren += 1;
            node = node.children[char];
        }
    }
    find(word) {
        let node = this.root;
        let count = 0;
        for (let char of word) {
            if (node.children[char]) {
                node = node.children[char];
            } else
                return 0;
        }
        count += node.isCompleteWord ? 1 : 0;
        return count + node.wordsInChildren;
    }
}