Hi these are some pills(little conceptional parts) that you can use daily bases of your programmer's life.
So i compill all of Strings to Numbers and Numbers to Strings functions and proprieties that we can use for it in javascript language.

_Strings_to Numbers

• First pill use String() :

let number="55 86 4232 5267";
console.log("My cellphone number is" + String(number));

• Second pill use .toString() ::

let number="55 86 4232 5267";
console.log("my cellphone number is" + number.toString());

Numbers to String

• Thirth pill use Number:

let width = "90";
let height = "25";
console.log(Number(width) * Number(height));

• Fourth pill use +

let width = "9000";
let height = "80";
console.log( + width * + height);

happy coding!! :))