object-assign-example

const pokemon = [
   { name: 'pikachu', strength: 5, evolved: false, },
   { name: 'snorlax', strength: 3, evolved: false, },
   { name: 'mewtwo', strength: 2.5, evolved: false, },
   { name: 'onyx', strength: 1.5, evolved: false, },
 ];
 
const transformedPokemon = pokemon.map(function (pokemon) {
   return Object.assign({}, pokemon, {
     strength: pokemon.strength * 2,
     evolved: true,
   });
 });