>Why are so many compilers not utilizing more pure functional paradigms? Focusing on transformations of input to output instead of doing side effects. It seems

>Why are so many compilers not utilizing more pure functional paradigms? Focusing on transformations of input to output instead of doing side effects. It seems like such a perfect fit The primary engineering and scientific challenge of compilers is optimization. That is all about finding a needle in a haystack, converting that to a slightly different needle, and putting it back in the same location in the haystack. This is something functional languages are fairly poor at.