[Edu-sig] The Great Computer Language Shootout

[Luby Liao]

Kirby, 

 > >2. ocaml is very promising language:
 > 
 > agreed.
 > 
 > in caml interactive you can write a function to compose
 > two functions, i.e. build r(x) from f(g(x)) or g(f(x)).
 > 
 >   #let compose f g = function x -> f(g(x));;
 >   val compose : ('a -> 'b) -> ('c -> 'a) -> 'c -> 'b = <fun>
 >  
 >   #let cos2 = compose square cos;;
 >   val cos2 : float -> float = <fun>
 > 
 > Drawing a blank this AM re how to do this in Python, trying
 > various things with little lambda.
 > 
 > Clues?

How about:

  def compose(f,g):
      global _f, _g
      _f = f
      _g = g
      return lambda x: _f(_g(x))

  if __name__ == '__main__':
      from math import *
      print compose(sin, sqrt)(3)
      print sin(sqrt(3))

    0.98702664499
    0.98702664499


cheers, Luby