JavaScript Number data type and global Number object explained | JS for Beginners Ep. 15

Numbers in JavaScript are treated differently than in other programming languages. Specifying the exact data type, such as an integer, float or double, isn't necessary. Aside from allowing complex mathematical calculations without any typecasting necessary, JavaScript also provides a global Number object, which comes with a set of useful properties and methods.

Examples in this JavaScript beginner tutorial explain how strings can be converted to numbers, and how numbers can be verified with the isNaN() method to avoid errors, among other things.