def pairs

bendtorch@1.3.0.0 · dtype.bend:141

import Base

141# the values two by two; an odd last one is paired with 0
142def pairs(xs: List<&2, U32>) -> List<&2, HW>:
143  match xs:
144    case Nil{}:
145      Nil{}
146    case Con{a, Nil{}}:
147      [HW{a, 0}]
148    case Con{a, Con{b, t}}:
149      HW{a, b} <> pairs(t)