CodHeK

traverse(root, word) {
    if(root.isLeaf) {
      this.suggestions.push(word);
      return;
    }

    for(const letter in root.children) {
        this.traverse(root.children[letter], word + letter);
    }
}

CodHeK

find(word) {
  let root = this.trie;
  for(const letter of word) {
      if(letter in root.children) {
          root = root.children[letter];
      }
      else {
          return null; // if not found return null
      }
  }

CodHeK

this.trie = {
  isLeaf: false,
  children: {
     'a': {
        isLeaf: false,
        children: {
          'n': {
              isLeaf: false,
              children: {
                't': {

CodHeK

newNode() {
   return {
       isLeaf: false,
       children: {}
   } 
}

add(word) {
    if(!this.trie) this.trie = this.newNode();

CodHeK

class Trie {
  constructor() {
    this.trie = null;
    this.suggestions = [];
  }
}

CodHeK

let dummy1 = 10;

console.log(window.dummy1) // undefined

const dummy2 = 10;

console.log(window.dummy2) // undefined

const f = () => {
  console.log("THIS DOESN'T WORK"); // TypeError: window.f is not a function

CodHeK

const obj = {
  prop: 'Hello',
  method: function() {
    'use strict'
    function inner() {
       console.log(this === undefined); // true
       console.log(this.prop + ', World!'); // TypeError: Cannot read property 'prop' of undefined
    }
    
    inner();

CodHeK

const obj = {
  prop: 'Hello',
  method: function() {
    setTimeout(() => {
       console.log(this.prop + ', World!'); // Hello, World!
    }, 2000);
  }
};

obj.method();

CodHeK

const obj = {
  prop: 'Hello',
  method: function() {
    function inner() {
       console.log(this.prop + ', World!'); // Hello, World!
    }
    
    inner.call(this);
  }
};

CodHeK

const obj = {
  prop: 'Hello',
  method: function() {
    const callback = function() {
       console.log(this.prop + ', World!'); // Hello, World!
    }
    
    setTimeout(callback.bind(this), 2000);
  }
};