DynamicArray.swap_checked_at: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/src/containers/dynamic_array.bend as DynamicArray
Lines 680-688 of bend-collections@1.0.0.0/src/containers/dynamic_array.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/src/containers/dynamic_array.bend&start_line=680&end_line=688

import Base
import bend-collections@1.0.0.0/src/containers/types/dynamic_array.bend as E

# Copyable-element exchange, used by indexed collection storage. The previous
# value is returned and all other slots remain unchanged. Like set_at, an
# invalid index leaves the array unchanged and reports IndexOutOfRange.
def swap_checked_at(~T: Data, limit: Nat, depth: Nat, cap: Nat, len: Nat, arr: Array<Maybe<&2, T>>, i: Nat, v: T, ok: Bool) -> DynArray<&2, T> & Result<&2, &2, E.Error, T>:
  match ok:
    case True{}:
      get_found_at(~T, limit, depth, cap, len, Array.swap(Maybe<&2, T>, arr, U32.from_nat(i), Some{v}))
    case False{}:
      (DA{limit, depth, cap, len, arr}, Fail{E.IndexOutOfRange{}})

Uses (12):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Array
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Array.swap
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Result
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.from_nat
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/containers/dynamic_array.bend&name=DynArray
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/containers/dynamic_array.bend&name=get_found_at
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/containers/types/dynamic_array.bend&name=Error