Is there a name for a function that becomes a NOOP after first call?

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Is there a name for a function that should only be called once, but can safely be called multiple times without knowledge of whether it has been called before (i.e. it becomes a NOOP after the first call)?

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Nate Eldredge On

You might be looking for the word idempotent, which refers in general to an operation where doing it several times has the same result as doing it once.