There's a word I can't remember that means, essentially, "has no side effects, has no randomness, and accepts no input other than user input", and describes a function for which, given an input X, always returns the same input Y, and given an input X1, always returns the same input Y1, which is not necessarily the same as Y.
It's not "idempotent", which is "always gives the same result regardless of input", but I can't think of what it is.
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