// Using function declaration

const countries = ['Finland', 'Estonia', 'Sweden', 'Norway']

const newCountries = countries.map(function (country) {

return country.toUpperCase()

})

console.log(newCountries)

// map using an arrow function call back

const countries = ['Finland', 'Estonia', 'Sweden', 'Norway']

const newCountries = countries.map((country) => country.toUpperCase())

console.log(newCountries) // ["FINLAND", "ESTONIA", "SWEDEN", "NORWAY"]

const countriesLength = countries.map(country => country.length)

console.log(countriesLength) // [7, 7, 6, 6]

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

const squares = numbers.map(n => n ** 2)

console.log(squares) // [1, 4, 9, 16, 25]