Adding default properties to an array of objects

default-property-function.js

const pokemon = [
  {
    name: 'Charmander',
    type: 'Fire'
  },
  { name: 'Squirtle', type: 'Water', abilities: ['Torrent', 'Rain Dish'] },
  {
    name: 'Bulbasur',
    type: 'Plant'
  }
];

function setDefaultAbilities(object) {
  const { abilities = [], ...rest } = object;
  return { ...rest, abilities };
}

// Applying the setDefaultAbilities function to all the pokemon in the array:
const normalizedPokemon = pokemon.map(pokemon => setDefaultAbilities(pokemon));

console.log(normalizedPokemon);
//Result: [ { name: 'Charmander', type: 'Fire', abilities: [] },   { name: 'Squirtle', type: 'Water', abilities: [ 'Torrent', 'Rain Dish' ] }, { name: 'Bulbasur', type: 'Plant', abilities: [] } ]