map()

.map() = accepts a callback and applies that function to each element of an array, then return a new array

const numbers = [1, 2, 3, 4, 5];
 
const squares = numbers.map(square);
const cubes = numbers.map(cube);
 
function square(element){
	return Math.pow(element, 2);
}
 
function cube(element){
	return Math.pow(element, 3);
}

an other example:

const dates = ["2024-1-10","2025-2-20","2026-3-30"];
const formattedDates = dates.map(formatDates);
 
console.log(formattedDates)
 
function formatDates(element){
	const parts = element.split("-");
	return `${parts[1]}/${parts[2]}/${parts[3]}`;
}