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Head function and Composing find #140

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Head function and Composing find #140

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5 changes: 5 additions & 0 deletions Stdlib/Data/List/Base.juvix
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Original file line number Diff line number Diff line change
Expand Up @@ -165,6 +165,11 @@ head {A} (defaultValue : A) (list : List A) : A :=
| x :: _ := x
| nil := defaultValue;

--- 𝒪(1). Grabs the first element of a ;List;
headMaybe {A} : List A -> Maybe A
| (x :: _) := just x
| nil := nothing;

syntax iterator any {init := 0; range := 1};

--- 𝒪(𝓃). Returns ;true; if at least one element of the ;List; satisfies the predicate.
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