The generic function search-for-item returns the index of an item in a collection.
capi
search-for-item collection item
| collection⇩ | 
A collection. | 
| item⇩ | 
A Lisp object. | 
Returns the index of item in collection, using its collection-test-function to determine equality, and returns nil if no match is found.
The search is done by sequentially comparing item to each item in collection using the collection's test-function, which is cl:eq by default.
search-for-item is the counterpart function to get-collection-item which given an index, finds the appropriate item.
CAPI User Guide and Reference Manual (Unix version) - 01 Dec 2021 19:32:42