How to cast an array

Here you'll see how to cast an array of strings to array of numbers in an easy way.

Prelude:

From time to time you need to convert an array of strings into array of numbers, but fortunetly JS has a solution for you:

const arrStrings = ['12', '12.4', '20', '2.1'];
const arrNumbers = [14, 2.3, 19, 22.2];

console.log(arrStrings.map(Number)); // [12, 12.4, 20, 2.1];
console.log(arrNumbers.map(String)); // ['14', '2.3', '19', '22.2'];

That works even for Boolean:

const arr = ['12', 0, 1, '', []];

console.log(arr.map(Boolean)); // [true, false, true, false, true];

Conclusion:

In case if you need to cast array of some types in another types you can use map with built-in types like String, Number and Boolean as well.