함수 shuffle()

shuffle

Collections.shuffle

1 Java

String strs[] = {"a", "b", "c", "d", "e", "f", "g"};
List<String> list = Arrays.asList(strs);
Collections.shuffle(list);
for (String str : list) {
  System.out.println(str);
}

2 JavaScript

inline style

var arr = ['q', 'r', 's', 't'];
arr.sort(function(){return 0.5-Math.random()});
console.log( arr );
// ["s", "r", "t", "q"]

function style

function shuffle(o){
    for(var j, x, i = o.length; i; j = Math.floor(Math.random() * i), x = o[--i], o[i] = o[j], o[j] = x);
    return o;
};
var arr = ['q', 'r', 's', 't'];
var newArr = shuffle(arr);
console.log( newArr );
// ["s", "q", "t", "r"]

3 jQuery

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script>
(function($){
    $.shuffle = function(arr) {
        for(var j, x, i = arr.length; i; j = parseInt(Math.random() * i), x = arr[--i], arr[i] = arr[j], arr[j] = x);
        return arr;
    }
})(jQuery);

var fruits = ["Apple", "Banana", "Orange", "Mango"];
$.shuffle(fruits);
console.log(fruits);
// ["Orange", "Mango", "Apple", "Banana"]
</script>

4 PHP

$arr = array("Apple", "Banana", "Orange", "Mango");
shuffle($arr);
print_r($arr);
// Array
// (
//     [0] => Mango
//     [1] => Orange
//     [2] => Apple
//     [3] => Banana
// )

5 Python

import random
fruits = ["Apple", "Banana", "Orange", "Mango"]
random.shuffle(fruits)
print fruits
# ['Orange', 'Banana', 'Mango', 'Apple']

6 Ruby

fruits = ["Apple", "Banana", "Orange", "Mango"]
puts fruits.sort{ rand }
# Mango
# Orange
# Apple
# Banana

7 같이 보기

• array
• random