public/subjects/squared

Squared

.filter is not the only useful array method that do loops for you.

map

The .map method is another very powerful tool once mastered, let's see it in action:

const time10 = [1, 2, 3, 4, 5].map((num) => {
  return `#${num}`
})

console.log(time10) // [`#1`, `#2`, `#3`, `#4`, `#5`]

Map takes a function and apply it to each elements of the array.

Note that map will never change the number of element of the array

For example if your function return nothing:

const nothingX3 = [1, 2, 3].map((num) => {
  // Not doing anything today...
})

console.log(nothingX3) // [undefined, undefined, undefined]

We still get an array of 3 elements, but they are undefined.

You should use map everytime you want to repeat the same action for all elements.

Instructions

Declare a function toSquares that takes an array of numbers and return an array of those squared numbers

Example:

const result = toSquares([1, 2, 3, 4])

console.log(result) // [1, 4, 9, 16]