3e+3 = 3000 - JavaScript query

Question

I was reading a JS book and there was a question asking for output of below:

3e+3

It is giving me 3000. Can someone explain why?

Answer 1

This is called scientific notation, the xey means "x times 10 to the power of y"

In your case, 3 * Math.pow(10, 3); // 3000

Answer 2

e declares an exponent. This is known as exponential or scientific notation.

3e+3 is equal to 3e3 (the + defines a positive number rather than addition), which is equal to 3 * (10^3) which is equal to 3 * (10*10*10) which is equal to 3000.