(╯°□°)╯ .map()

The map() array method manipulates data and returns a new array of changed data.

Example 1

We have an array of objects called dogs.

   {
      name: "Spike",
      age: 5,
      vaccinated: true,
      breed: "Border Terrier",
      likes: ["Being a good boy and eating tripe", "chasing cars"],
    },
    {
      name: "Rex",
      age: 8,
      vaccinated: true,
      breed: "Border Collier",
      likes: ["eating sticks on walkies", "attention"],
    },
    {
      name: "Boeta",
      age: 12,
      vaccinated: false,
      breed: "Labrador",
      likes: ["running super fast", "napping"],
    },
    {
      name: "Ozzy",
      age: 2,
      vaccinated: true,
      breed: "Chihuahua",
      likes: ["barking loudly", "treats"],
    },
  ];

Now, we want to manipulate the data and return a new array with only the dog breeds. We map over dogs and for each dog we return their breed to our new array.

const dogBreed = dogs.map((dog) => dog.breed);

// [ "Border Terrier", "Border Collier", "Labrador", "Chihuahua" ]

Example 2

We want to return a new array of both the dogs age and name. We will map through dogs and for each dog return their age and name.

const dogNameandAge = dogs.map((dog) => {
    return {
      name: dog.name,
      age: dog.age,
    };
  });

/*[
{name: "Spike", age: 5}
{ name: "Rex", age: 8 }
{ name: "Boeta", age: 12 }
{ name: "Ozzy", age: 2 }
]*/