def lookup

bend-kit-multipart@0.3.0.0 · multipart.bend:133

import Base

133# The first parameter named k (lowercase).
134def lookup(xs: List<&2, Param>, +k: String) -> Maybe<&2, String>:
135  match xs:
136    case Nil{}:
137      None{}
138    case Con{Param{+k2, +v}, t}:
139      Bool.pick(Maybe<&2, String>, String.eq(k2, k), Some{v}, lookup(t, k))