I’ve been doing a few algorithm exercises that deal with binary numbers lately. Since my language of choice for algorithm problems is JavaScript and I had in the past read a little about how JavaScript numbers work, I was really confused to find out that binary operations actually work, since JavaScript numbers are represented with an exponent-fraction notation.

A quick search gave me the answer to this question. When you do binary operations against a number this will be converted to an integer in two’s complement. Another interesting thing is that even though JavaScript numbers are built using 64 bits, they will be converted to 32 bits when doing binary operations. Lets see how these two factors affect our operations.