diff options
| -rw-r--r-- | lib/pure/random.nim | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/pure/random.nim b/lib/pure/random.nim index 7bb54cb8e..b4681610a 100644 --- a/lib/pure/random.nim +++ b/lib/pure/random.nim @@ -106,9 +106,9 @@ proc randomize*(seed: int) {.benign.} = state.a0 = ui(seed shr 16) state.a1 = ui(seed and 0xffff) -proc shuffle*[T](x: var seq[T]) = +proc shuffle*[T](x: var openArray[T]) = ## Will randomly swap the positions of elements in a sequence. - for i in countdown(x.high, 0): + for i in countdown(x.high, 1): let j = random(i + 1) swap(x[i], x[j]) @@ -139,4 +139,9 @@ when isMainModule: doAssert false, "too few occurrences of " & $i elif oc > 130: doAssert false, "too many occurrences of " & $i + + var a = [0, 1] + shuffle(a) + doAssert a[0] == 1 + doAssert a[1] == 0 main() |