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Add the Nth function #144

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Add the Nth function #144

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61e7cd7
add new modules to index.juvix
lukaszcz Nov 6, 2024
a567cf1
Add a maybe head function
mariari Nov 7, 2024
386b38e
Write the nth function
mariari Nov 7, 2024
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9 changes: 9 additions & 0 deletions Stdlib/Data/List/Base.juvix
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Original file line number Diff line number Diff line change
Expand Up @@ -96,6 +96,10 @@ drop {A} : (elemsNum : Nat) -> (list : List A) -> List A
| (suc n) (x :: xs) := drop n xs
| _ xs := xs;

--- Take the nth value of a ;List;
nth {A} : Nat -> List A -> Maybe A
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Can we use the named syntax to allow people using it in case the want to?

| n := drop n >> headMaybe;

--- 𝒪(𝓃). Returns a tuple where first element is the
--- prefix of the given list of length prefixLength and second element is the
--- remainder of the ;List;.
Expand Down Expand Up @@ -165,6 +169,11 @@ 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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16 changes: 13 additions & 3 deletions index.juvix
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Expand Up @@ -10,8 +10,18 @@ Compiler: http://github.com/anoma/juvix
module index;

import Stdlib.Prelude;
import Stdlib.Data.Nat.Ord;
import Stdlib.Data.Int.Ord;
import Stdlib.Data.String.Ord;

import Stdlib.Data.BinaryTree;
import Stdlib.Data.Set;
import Stdlib.Data.Map;
import Stdlib.Data.UnbalancedSet;
import Stdlib.Data.Queue;
import Stdlib.Data.Tree;

import Stdlib.Cairo.Ec;
import Stdlib.Cairo.Poseidon;
import Stdlib.Cairo.Pedersen;

import Stdlib.Debug;

import Stdlib.Extra.Gcd;
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