Learn
Iterators
The .map() Method

The second iterator we’re going to cover is `.map()`. When `.map()` is called on an array, it takes an argument of a callback function and returns a new array! Take a look at an example of calling `.map()`:

``````const numbers = [1, 2, 3, 4, 5];

const bigNumbers = numbers.map(number => {
return number * 10;
});``````

`.map()` works in a similar manner to `.forEach()`— the major difference is that `.map()` returns a new array.

In the example above:

• `numbers` is an array of numbers.
• `bigNumbers` will store the return value of calling `.map()` on `numbers`.
• `numbers.map` will iterate through each element in the `numbers` array and pass the element into the callback function.
• `return number * 10` is the code we wish to execute upon each element in the array. This will save each value from the `numbers` array, multiplied by `10`, to a new array.

If we take a look at `numbers` and `bigNumbers`:

``````console.log(numbers); // Output: [1, 2, 3, 4, 5]
console.log(bigNumbers); // Output: [10, 20, 30, 40, 50]``````

Notice that the elements in `numbers` were not altered and `bigNumbers` is a new array.

### Instructions

1.

Add your code under the `animals` array and before the line `console.log(secretMessage.join(''));`

Use `.map()` to create a new array that contains the first character of each string in the `animals` array. Save the new array to a `const` variable named `secretMessage`.

2.

Use `.map()` to divide all the numbers in `bigNumbers` by `100`. Save the returned values to a variable declared with `const` called `smallNumbers`.