History of Idiom 11 > diff from v20 to v21

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Version 20

2015-09-06, 14:30:32

Version 21

2015-10-29, 14:05:12

Idiom #11 Pick a random element from a list

List x must be non-empty.

Idiom #11 Pick a random element from a list

List x must be non-empty.

Haskell

Haskell

Code

return.(x!!)=<<System.Random.randomRIO(0,length x-1)

Code

return.(x!!)=<<System.Random.randomRIO(0,length x-1)

Pascal

Pascal

Imports

classes

Imports

classes

Code

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

Code

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

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If x is a TList or TStrings -descendent

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If x is a TList or TStrings -descendent

Pascal

Pascal

Code

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

Code

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

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if x is an Array

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if x is an Array

Perl

Perl

Code

my @list = ('a', 'list', 'of', 'random', 'item's);

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

Code

my @list = ('a', 'list', 'of', 'random', 'item's);

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

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In scalar context (such as the call to rand), an array evaluates to the length.

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In scalar context (such as the call to rand), an array evaluates to the length.

Code

$x[ array_rand($x) ]

Code

$x[ array_rand($x) ]

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array_rand returns the key, and we want the value.

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array_rand returns the key, and we want the value.

Doc URL

http://php.net/array_rand

Doc URL

http://php.net/array_rand

Imports

#include <stdlib.h>

Imports

#include <stdlib.h>

Code

x[rand() % x_length];

Code

x[rand() % x_length];

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rand needs to be initialized by calling void srand(unsigned int);

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rand needs to be initialized by calling void srand(unsigned int);

Imports

import "math/rand"

Imports

import "math/rand"

Code

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

Code

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

Origin

http://rosettacode.org/wiki/Pick_random_element#Go

Origin

http://rosettacode.org/wiki/Pick_random_element#Go

Demo URL

http://play.golang.org/p/hTw7pc7SN-

Demo URL

http://play.golang.org/p/hTw7pc7SN-

Python

Python

Imports

import random

Imports

import random

Code

random.choice(x)

Code

random.choice(x)

Java

Java

Imports

import java.util.Random;

Imports

import java.util.Random;

Code

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

Code

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

Origin

http://rosettacode.org/wiki/Pick_random_element#Java

Origin

http://rosettacode.org/wiki/Pick_random_element#Java

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History of Idiom 11 > diff from v20 to v21

Version 20

Version 21

Idiom #11 Pick a random element from a list

Idiom #11 Pick a random element from a list

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