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  1. Prepare
  2. Functional Programming
  3. Introduction
  4. List Replication
  5. Discussions

List Replication

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  • viyowi6770
     + 0 comments

    To repeat each element in a list a given number of times, use a simple list comprehension like: return [x for x in arr for _ in range(num)]. It preserves the order and repeats each item num times. Learn more cool comparisons like this in the Doraemon X APK mod vs official comparison.

  • nemay81983
     + 0 comments

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  • tanghocle456
     + 0 comments

    For Ocaml

    let rec duplicate_arr n ch = 
    if (n > 0) then ch:: duplicate_arr (n-1) ch
    else []
    
let rec f n arr = match arr with 
    | [] -> []
    | h::t -> (duplicate_arr n h)@(f n t)

  • jvjdev
     + 0 comments
    open System;

let n = Console.ReadLine () |> int

let rec read arr =
    match Console.ReadLine () with
    | x when String.IsNullOrEmpty x -> arr
    | x -> x :: arr |> read

read []
|> List.rev
|> List.collect (fun x -> List.replicate n x)
|> Seq.iter (fun x -> printfn "%s" x)

  • aayushreg
     + 0 comments
    f :: Int -> [Int] -> [Int]
f n [] = []
f n (x:xs) =  (helper (n) (x:xs)) ++ f (n) xs
    where helper n (x:xs)   | n==0 = []
                            | otherwise = x:helper (n-1) (x:xs)

    Haskell beginner here

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