Function definition: Difference between revisions

Content added Content deleted

Inline

@@ Line 857: / Line 857: @@
 =={{header|Python}}==
+Function definition:
-Named function:
 <lang python>def multiply(a, b):
     return a * b</lang>
-Unnamed function:
+Lambda function definition:
 <lang python>multiply = lambda a, b: a * b</lang>
-A callable class, which may be useful to allow both simple functions and complex classes to use the same interface:
+A callable class definition allows functions and classes to use the same interface:
-<lang python>class Multiplier:
+<lang python>class Multiply:
+    def __init__(self):
-    callcount = 0
-    def __init__(self, a=1):
+        pass
-        self.multiplicand = a
     def __call__(self, a, b):
-        Multiplier.callcount += 1
+        return a * b
-        return self.multiplicand * a
-m4 = Multiplier(4)
-m2 = Multiplier(2)
-print m4(2), m4(4), m4(12), m2(2), m2(3)
-### >>> 4 8 48 4 6</lang>
+multiply = Multiply()
-(This trite example implements a simplistic "curried" multiplication class ... but also keeps track of the total number of times any instance has been called as a function.  I can conceive of no useful application for it).
+print multiply(2, 4)    # prints 8</lang>
+(No extra functionality is shown in ''this'' class definition).
 =={{header|Q}}==