The map () method invokes the callback function passed by argument for each element of the Array and returns a new Array as a result.

map.ts

const temperatureCelsius = [0, 22, 31, 40, 45, 12, 3];
const toFahrenheit = (value) => (value * 9) / 5 + 32;
const temperatureFahrneheit = temperatureCelsius.map(toFahrenheit);

console.log(temperatureCelsius);
console.log(temperatureFahrneheit);