Assertion: lisp's function | /r/HasProperty | useful
Facets:
Source sentences:
text: If it is necessary to test whether a predicate is true of all elements of a list or vector (element 0 and element 1 and element 2 and ...), then the function every may be useful.
text: If it is necessary to test whether a predicate is true of one or more elements of a list or vector (element 0 or element 1 or element 2 or ...), then the function some may be useful.