Javascript addition and subtraction with a string value

Question

I recently went through this typecast JS question:

Given \'11\'+10, the answer is 1110. It is clear that is not 21 because one

Answer 1

The addition + is used first for string concatenation (if at least one operand is string) and in other cases as numbers arithmetical addition. The subtraction always converts the operands to numbers. Check this article for more details about addition operator.