Need some explaination regarding why "1"- -"1" expression returns 2?

Question

Going through an online test, i found this weird expression where

"1"- -"1" = 2

i understand -"1" will be converted to number, but the other "1"- is getting converted too?

Answer 1

You can't subtract strings - so they are converted to numbers:

1 - -1

Two minuses make a plus:

1 + 1

And if you can prove it, that is equal to 2:

1 + 1 = 2

console.log("1" - - "1");