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Mutator method
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<p>In <a href="/facts/Computer_science/lN3pEyPz">computer science</a>, a mutator method is a <a href="/facts/Method_(computer_science)/8kAXxVYs">method</a> used to control changes to a variable. They are also widely known as setter methods. Often a setter is accompanied by a getter, which returns the value of the private member variable. They are also known collectively as accessors. </p><p>The mutator method is most often used in <a href="/facts/Object-oriented_programming/TxNMEcao">object-oriented programming</a>, in keeping with the principle of <a href="/facts/Encapsulation_(computer_science)/kzDnbHPe">encapsulation</a>. According to this principle, member <a href="/facts/Variable_(programming)/VoCKtwml">variables</a> of a <a href="/facts/Class_(computer_science)/zvzkSAtE">class</a> are made private to hide and protect them from other code, and can only be modified by a public member function (the mutator method), which takes the desired new value as a parameter, optionally validates it, and modifies the private <a href="/facts/Member_variable/BAtCyPVd">member variable</a>. Mutator methods can be compared to <a href="/facts/Assignment_(computer_science)/kLevAoyJ">assignment</a> <a href="/facts/Operator_overloading/hRyHs4Qf">operator overloading</a> but they typically appear at different levels of the object hierarchy. </p><p>Mutator methods may also be used in non-object-oriented environments. In this case, a <a href="/facts/Pointer_(computer_programming)/fPoNzy9b">reference</a> to the variable to be modified is passed to the mutator, along with the new value. In this scenario, the compiler cannot restrict code from bypassing the mutator method and changing the variable directly. The responsibility falls to the <a href="/facts/Software_developer/WGTS1Jv9">developers</a> to ensure the variable is only modified through the mutator method and not modified directly. </p><p>In programming languages that support them, <a href="/facts/Property_(programming)/MRIIAw5g">properties</a> offer a convenient alternative without giving up the utility of encapsulation. </p><p>In the examples below, a fully implemented mutator method can also <a href="/facts/Data_validation/tFCchJTM">validate</a> the input data or take further action such as triggering an <a href="/facts/Event_(computing)/0YdM6AoB">event</a>. </p>