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| ANSI Common Lisp 17 Sequences 17.2 Rules about Test Functions ### 17.2.2 Satisfying a One-Argument Test When using one of the functions in the next figure, the elements E of a sequence S are filtered not on the basis of the presence or absence of an object O under a two argument predicate, as with the functions described in Section 17.2.1 Satisfying a Two-Argument Test, but rather on the basis of a one argument predicate.
Operators that have One-Argument Tests to be Satisfied
assoc-if | member-if | rassoc-if
assoc-if-not | member-if-not | rassoc-if-not
count-if | nsubst-if | remove-if
count-if-not | nsubst-if-not | remove-if-not
delete-if | nsubstitute-if | subst-if
delete-if-not | nsubstitute-if-not | subst-if-not
find-if | position-if | substitute-if
find-if-not | position-if-not | substitute-if-not
The element Ei might not be considered directly. If a `:key` argument is provided, it is a designator for a function of one argument to be called with each Ei as an argument, and yielding an object Zi to be used for comparison. (If there is no `:key` argument, Zi is Ei.) Functions defined in this specification and having a name that ends in "`-if`" accept a first argument that is a designator for a function of one argument, Zi. An Ei is said to satisfy the test if this `:test` function returns a generalized boolean representing true. Functions defined in this specification and having a name that ends in "`-if-not`" accept a first argument that is a designator for a function of one argument, Zi. An Ei is said to satisfy the test if this `:test` function returns a generalized boolean representing false. 17.2.2.1 Examples of Satisfying a One-Argument Test

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