Pipe functions left to right

pipe(f, g)(x) means g(f(x)). Same machinery as compose, opposite direction, and far easier to read for a data transformation: trim, then split, then count.

Implement pipe(...fns). It returns a function that invokes the leftmost function with all of the arguments it received, then passes each result to the next function to the right, and returns the rightmost function's result. Given no functions at all, the returned function returns its first argument unchanged.

What it has to do

• Apply the functions left to right.
• Pass every argument to the leftmost function; the rest each receive one value.
• With no functions, return the first argument unchanged.
• Support a chain of more than two functions whose types change along the way.

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