Consider making compose binary: compose(f, g)

Question

Consider making compose binary: compose(f, g)

dvdzkwsk opened this issue 8 years ago · comments

David Wilhelm · Answer 1 · Thu Dec 22 2016 01:06:05 GMT+0800 (China Standard Time)

What would be the advantage here?

David Zukowski · Answer 2 · Wed Mar 01 2017 22:39:30 GMT+0800 (China Standard Time)

Nothing exceptional IMO, but it would simplify its signature and slightly improve the performance characteristics. Mathematical composition involves two functions, and this is emulated in many functional languages where compose is binary. If you compose more than two functions together, you should be composing compositions such as:

compose(f, compose(g, h))

It has the added benefit of making the syntax slightly more concise (vs. compose(f, g) vs. compose([f, g])) but I don't think I'm ready to sacrifice some of this utility just for mathematical correctness. Going to punt in this for now.