findWordsInBoard.js

const findWordsInBoard = (board, listOfWords) => {
  /* Returns a subset of words in listOfWords 
   * that can be formed from characters on board
   */
};
const BOARD = [
  ['g','r','t','a'],
  ['n','i','a','e'],
  ['d','k','w','r'],
  ['t','e','l','v']
];
const listOfWords = ['nile', 'pea', 'eat', 'grind', 'nike', 'vine', 'take', 'die'];
findWordsInBoard(BOARD, listOfWords); //returns ['eat', 'grind', 'nike']