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TwoFX merged 1 commit into from
Mar 25, 2026
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66 #300

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29 changes: 26 additions & 3 deletions HumanEvalLean/HumanEval66.lean
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Original file line number Diff line number Diff line change
@@ -1,7 +1,30 @@
module

def digitSum : Unit :=
()
def digitSum (s : String) : Nat :=
s.chars.filter Char.isUpper
|>.map Char.toNat
|>.fold (init := 0) (· + ·)

example : digitSum "" = 0 := by cbv
example : digitSum "abAB" = 131 := by cbv
example : digitSum "abcCd" = 67 := by cbv
example : digitSum "helloE" = 69 := by cbv
example : digitSum "woArBld" = 131 := by cbv
example : digitSum "aAaaaXa" = 153 := by cbv

theorem digitSum_eq {s : String} :
digitSum s = ((s.toList.filter Char.isUpper).map Char.toNat).sum := by
simp [digitSum, ← Std.Iter.foldl_toList, List.sum_eq_foldl]

theorem digitSum_empty : digitSum "" = 0 := by simp [digitSum_eq]

theorem digitSum_push_of_isUpper {s : String} {c : Char} (h : c.isUpper = true) :
digitSum (s.push c) = digitSum s + c.toNat := by
simp [digitSum_eq, List.filter_cons_of_pos h]

theorem digitSum_push_of_isUpper_eq_false {s : String} {c : Char} (h : c.isUpper = false) :
digitSum (s.push c) = digitSum s := by
simp [digitSum_eq, List.filter_cons_of_neg (Bool.not_eq_true _ ▸ h)]

/-!
## Prompt
Expand Down Expand Up @@ -50,4 +73,4 @@ def check(candidate):
assert candidate("You arE Very Smart") == 327, "Error"

```
-/
-/
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