Bytes.uint.if: def of bend-kit-bytes@0.3.3.0
Import: import bend-kit-bytes@0.3.3.0/bytes.bend as Bytes
Lines 176-183 of bend-kit-bytes@0.3.3.0/bytes.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-bytes@0.3.3.0/bytes.bend&start_line=176&end_line=183

import Base

# Big-endian reads forward from i; little-endian reads back from the last byte.
def uint.if(ok: Bool, +len: U32, buf: Array<U32>, +i: U32, +n: U32, +be: Bool) -> Bytes & Maybe<&2, U32>:
  match ok:
    case True{}:
      +j = Bool.pick(U32, be, i, (i + n - 1 : U32))
      get.some(len, uint.go(U32.to_nat(n), peek(buf, j), j, be, 0))
    case False{}:
      (Bytes{len, buf}, None{})

Uses (14):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Array
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.pick
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.sub
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.to_nat
  https://jend.leeeet.dev/definition.txt?path=bend-kit-bytes@0.3.3.0/bytes.bend&name=Bytes
  https://jend.leeeet.dev/definition.txt?path=bend-kit-bytes@0.3.3.0/bytes.bend&name=get.some
  https://jend.leeeet.dev/definition.txt?path=bend-kit-bytes@0.3.3.0/bytes.bend&name=peek
  https://jend.leeeet.dev/definition.txt?path=bend-kit-bytes@0.3.3.0/bytes.bend&name=uint.go