Thursday, 24 December 2015

DRY in action - Use lambda to fixate method's argument


In the following example we have a situation where Foo() calls Bar() multiple times. Within each Foo() call, it passes to Bar() different value for string argument but always the same value for int argument:

Output:


i = 123, s = test1
i = 123, s = test2
i = 123, s = test3
i = 456, s = test1
i = 456, s = test2
i = 456, s = test3


To avoid unnecessary repetition we can introduce one level of indirection - a lambda which calls Bar() and provides it string value via its own argument and int value via capturing argument passed to Foo(). After refactoring:

Output:


i = 123, s = test1
i = 123, s = test2
i = 123, s = test3
i = 456, s = test1
i = 456, s = test2
i = 456, s = test3


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