What does 'x << ~y' represent in JavaScript?

Question

What does \'x << ~y\' represent in JavaScript?

I understand that the bitwise SHIFT operation does this:

x << y AS x * 2y         


        

Answer 1

~x will reverse the bit representation of your x value (32 bits signed value with two's complement).

x << y is the left shift operator (here left). Your mathematical interpretation is correct :)

You can read more about bitwise operations over here: bitwise operators in Javascript