def find

near-v-framework@0.4.0.0 · general/rose/ops.bend:47

import Base
import near-v-framework@0.4.0.0/general/rose/type.bend as R

47# The value at a key, if the forest has it.
48def find(-N: Data, +k: String, rs: List<&2, R.Rose<N>>) -> Maybe<&2, N>:
49  match rs:
50    case []:
51      None{}
52    case r <> rest:
53      match r:
54        case R.Rose{rk, v, kids}:
55          found(N, String.eq(k, rk), v, find(N, k, kids), find(N, k, rest))