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Immutable interface
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<p>In <a href="/facts/Object-oriented_programming/TxNMEcao">object-oriented programming</a>, "immutable interface" is a <a href="/facts/Design_pattern_(computer_science)/mV7r4egw">pattern</a> for designing an <a href="/facts/Immutable_object/Gsoq1bba">immutable object</a>. The immutable interface pattern involves defining a type which does not provide any <a href="/facts/Method_(computer_science)/8kAXxVYs">methods</a> which mutate state. Objects which are referenced by that type are not seen to have any mutable state, and appear immutable. </p>