Data commit

Task/First-class-functions-Use-numbers-analogously/Python/first-class-functions-use-numbers-analogously-1.py

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+IDLE 2.6.1
+>>> # Number literals
+>>> x,xi, y,yi = 2.0,0.5, 4.0,0.25
+>>> # Numbers from calculation
+>>> z  = x + y
+>>> zi = 1.0 / (x + y)
+>>> # The multiplier function is similar to 'compose' but with numbers
+>>> multiplier = lambda n1, n2: (lambda m: n1 * n2 * m)
+>>> # Numbers as members of collections
+>>> numlist = [x, y, z]
+>>> numlisti = [xi, yi, zi]
+>>> # Apply numbers from list
+>>> [multiplier(inversen, n)(.5) for n, inversen in zip(numlist, numlisti)]
+[0.5, 0.5, 0.5]
+>>>

Task/First-class-functions-Use-numbers-analogously/Python/first-class-functions-use-numbers-analogously-2.py

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+>>> # Some built in functions and their inverses
+>>> from math import sin, cos, acos, asin
+>>> # Add a user defined function and its inverse
+>>> cube = lambda x: x * x * x
+>>> croot = lambda x: x ** (1/3.0)
+>>> # First class functions allow run-time creation of functions from functions
+>>> # return function compose(f,g)(x) == f(g(x))
+>>> compose = lambda f1, f2: ( lambda x: f1(f2(x)) )
+>>> # first class functions should be able to be members of collection types
+>>> funclist = [sin, cos, cube]
+>>> funclisti = [asin, acos, croot]
+>>> # Apply functions from lists as easily as integers
+>>> [compose(inversef, f)(.5) for f, inversef in zip(funclist, funclisti)]
+[0.5, 0.4999999999999999, 0.5]
+>>>