def hdr_all.of

bendonnect-rpc@0.1.0.0 · src/protocol.bend:143

import Base

143def hdr_all.of(r: Map<&2, List<&2, String>> & List<&2, String>) -> Maybe<&2, String>:
144  (m, v) = r
145  match v:
146    case Nil{}:
147      None{}
148    case Con{x, rest}:
149      Some{String.join(Con{x, rest}, ",")}