Idiom #11 Pick a random element from a list

List x must be non-empty.

x[Math.floor(Math.random() * x.length)]

#include <stdlib.h>

x[rand() % x_length];

(rand-nth x)

#include <random>

std::mt19937 gen;
std::uniform_int_distribution<size_t> uid (0, x.size () - 1);
x[uid (gen)];

using System;
using System.Collections.Generic;

x[new Random().Next(x.Count)];

import std.random;

x.randomSample(1);

x[new Random().nextInt(x.length)];

Enum.random(x)

lists:nth(rand:uniform(length(X)), X).

https://github.com/inaka/erlang-katana

ktn_random:pick(X)

import "math/rand"

func pickT(x []T) T {
	return x[rand.Intn(len(x))]
}

import "math/rand"

x[rand.Intn(len(x))]

import System.Random (randomRIO)

(l !!) <$> randomRIO (0, length l - 1)

import System.Random (randomR)

(\l g -> l !! (randomR (0, length l) g))

import java.util.Random;

x.get(new Random().nextInt(x.size()))

x[math.random(#x)]

$x[ array_rand($x) ]

uses classes;

element := x.Items[random(x.count)];

element := x[random(length(x))];

my @x = ('a', 'list', 'of', 'random', 'items');

print $list[ rand(@x) ], "\n";

import random

random.choice(x)

x.sample

use rand::{self, Rng};

x[rand::thread_rng().gen_range(0, x.len())]

extern crate rand;
use rand::{thread_rng, Rng};

let choice = thread_rng().choose(&x).unwrap();

import scala.util.Random

val x = List(1, 2, 3, 4)
x.apply(Random.nextInt(x.size))

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