The reason pure functional programming is good for "ripping out and replacing" code is because your code units necessarily have fewer interdependencies. a pure

The reason pure functional programming is good for "ripping out and replacing" code is because your code units necessarily have fewer interdependencies. a pure functional language is really good for writing dumb code that "just works" in the sense that it does what you need it to do even if it isn't very pretty or fast, while at the same time keeping it reasonably maintainable because the code will not be rife with accidental complexity and assumptions about global state.