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# Control Couple ## Introduction Control coupling occurs when a method or block checks the value of a parameter in order to decide which execution path to take. The offending parameter is often called a _Control Couple_. Control Coupling is a kind of duplication, because the calling method already knows which path should be taken. Control Coupling reduces the code's flexibility by creating a dependency between the caller and callee: any change to the possible values of the controlling parameter must be reflected on both sides of the call. A _Control Couple_ also reveals a loss of simplicity: the called method probably has more than one responsibility, because it includes at least two different code paths. You can find a good write-up regarding this problem [here](http://solnic.eu/2012/04/11/get-rid-of-that-code-smell-control-couple.html). ## Current Support in Reek Reek performs the following checks that fall in this category: * [Control-Parameter](Control-Parameter.md) - a method parameter or block parameter is the tested value in a conditional statement * [Boolean-Parameter](Boolean-Parameter.md) - a method parameter is defaulted to `true` or `false`.
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49 entries across 47 versions & 2 rubygems