为什么这个 function 返回 boolean 值？

Question

I was wondering why this function returns true and false values? I wasn't expecting numbers necessarily, but am confused - is it something to do with how the forEach method works?

 function canDrive(...years){ years.forEach(cur => console.log((2020 - cur) >= 21)); } canDrive(1990, 1999, 1965)

Answer 1

It is "returning" boolean values because there is a comparison statement inside of the console.log:

console.log((2020 - cur) >= 21)

This is converting it to a boolean. (it is actually logging, not returning as @Bergi mentioned in the comments)