index.js

const doubleEachElement = (arr) => {
	return arr.map(element => element == 1 ? 2 : element * 2);
}

const squareEachElement = (arr) => {
	return arr.map(element => element * element);
}

const printOriginalAndModify = (arr, fn) => { 
	console.log('☎️ original', arr);
	const modified = fn(arr);
	console.log('📱 modified', modified);
	return modified;
}

const divideByTwo = (arr) => {
	return arr.map(element => element / 2);
}

printOriginalAndModify([1, 2, 3, 4, 5], divideByTwo);