Why does this expression return 2 in javaScript?

Question

I would think you might get 0, maybe because the strings are turned to 1's and the - operator causes a subtraction operation to take place?

"1" - - "1";

Thanks in advance!

Answer 1

It's how math works

1 - (-1) = 1 + 1

Answer 2

The - casts the string to a number and also acts as a minus sign.

1 - (-1) = 1 + 1 = 2