def hdr.of

bendonnect-rpc@0.1.0.0 · src/protocol.bend:131

import Base

131def hdr.of(r: Map<&2, List<&2, String>> & List<&2, String>) -> Maybe<&2, String>:
132  (m, v) = r
133  match v:
134    case Nil{}:
135      None{}
136    case Con{x, rest}:
137      Some{x}