rontolisp:alist-plist

(rontolisp:alist-plist alist)

Returns a property list holding the same keys and values as the association list alist, in the same order — the inverse of rontolisp:plist-alist. A lightweight subset of alexandria:alist-plist, so a program can switch to alexandria unchanged.

Unlike rontolisp:hash-table-plist there is no hash table in between, so the order is the input's — deterministic on every backend — and duplicate keys are kept rather than collapsed. An empty list returns nil.

Backend support

Works on every backend and in every WASM mode (Preview 1 included): the function is written in rontolisp itself (part of the prelude) and is compiled into the program when used.