Data commit

Task/Function-composition/Python/function-composition-4.py

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+from functools import reduce
+from math import sqrt
+
+
+def compose(*fs):
+    '''Composition, from right to left,
+       of an arbitrary number of functions.
+    '''
+    def go(f, g):
+        return lambda x: f(g(x))
+
+    return reduce(go, fs, lambda x: x)
+
+
+# ------------------------- TEST -------------------------
+def main():
+    '''Composition of three functions.'''
+
+    f = compose(
+        half,
+        succ,
+        sqrt
+    )
+
+    print(
+        f(5)
+    )
+
+
+# ----------------------- GENERAL ------------------------
+def half(n):
+    return n / 2
+
+
+def succ(n):
+    return 1 + n
+
+
+if __name__ == '__main__':
+    main()