B64.swap2: def of bendonnect-rpc@0.1.0.0
Import: import bendonnect-rpc@0.1.0.0/src/b64.bend as B64
Lines 22-28 of bendonnect-rpc@0.1.0.0/src/b64.bend: https://jend.leeeet.dev/read.txt?path=bendonnect-rpc@0.1.0.0/src/b64.bend&start_line=22&end_line=28

import Base

# Maps char a1 to b1 and a2 to b2, leaving other chars alone.
def swap2(s: String, +a1: U32, +b1: U32, +a2: U32, +b2: U32) -> String:
  match s:
    case SNil{}:
      SNil{}
    case SCon{Chr{+c}, t}:
      SCon{Chr{Bool.pick(U32, U32.is_eq(c, a1), b1, Bool.pick(U32, U32.is_eq(c, a2), b2, c))}, swap2(t, a1, b1, a2, b2)}

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.pick
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Char
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_eq