In JavaScript, when you perform arithmetic operations with values of different types, JavaScript tries to coerce the values into numbers before performing the operation. Here, true and false are coerced to their numeric equivalents, which are 1 and 0 respectively.

So, the expression true + false is equivalent to 1 + 0, which equals 1. Therefore, the output of the code will be:

1

JavaScript treats true as 1 and false as 0 when performing arithmetic operations like addition.