ruby array

Array.shuffle方法 (Array.shuffle Method)

In this article, we will study about Array.shuffle method. You all must be thinking the method must be doing something which is related to shuffling of elements or objects in the Array instance. It is not as simple as it looks. Well, we will figure this out in the rest of our content. We will try to understand it with the help of syntax and demonstrating program codes.

在本文中，我們將研究Array.shuffle方法 。 大家都必須認為該方法必須執行與Array實例中的元素或對象的改組有關的操作。 它并不像看起來那么簡單。 好吧，我們將在其余內容中解決這個問題。 我們將嘗試借助語法并演示程序代碼來理解它。

Method description:

方法說明：

This method is a public instance method and defined for the Array class in Ruby's library. This method works in such a way that it shuffles the objects present in the Array instance randomly. The return type of this method is an Array object which contains all the elements of self in a shuffled manner. You can also provide an optional argument rng which can be used as a random number generator. This method is one of the examples of non-destructive method which means that the changes created by this method are not permanent or temporary and would not impact the actual arrangement of elements in the self Array instance.

該方法是一個公共實例方法，為Ruby庫中的Array類定義。 該方法的工作方式是隨機地對Array實例中存在的對象進行洗牌。 此方法的返回類型是一個Array對象，它以隨機的方式包含self的所有元素。 您還可以提供一個可選參數rng ，可用作隨機數生成器。 此方法是非破壞性方法的示例之一，這意味著此方法創建的更改不是永久的或臨時的，并且不會影響self Array實例中元素的實際排列。

Syntax:

句法：

    array_instance.shuffle -> new_array
or
array_instance.shuffle(random:rng)-> new_array

Argument(s) required:

所需參數：

This method takes one argument which is optional. This argument can be used for random number generation.

此方法采用一個可選參數。 此參數可用于生成隨機數 。

Example 1:

范例1：

=begin
Ruby program to demonstrate shuffle method
=end
# array declaration
table = [2,4,6,8,10,12,14,16,18,20]
puts "Array shuffle implementation"
pq =table.shuffle
puts "Array instance after shuffling: #{pq}"
puts "Array instance:"
print table 

Output

輸出量

RUN 1:
Array shuffle implementation
Array instance after shuffling: [14, 18, 12, 16, 6, 4, 2, 10, 8, 20]
Array instance:
[2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
RUN 2:
Array shuffle implementation
Array instance after shuffling: [12, 14, 18, 2, 20, 10, 6, 4, 16, 8]
Array instance:
[2, 4, 6, 8, 10, 12, 14, 16, 18, 20]

Explanation:

說明：

In the above code, you can observe that we are shuffling the elements from the Array instance with the help of Array.shuffle method. You can observe that in both the runs, the output or the Array instance generated is different because the shuffling of the elements is always random. You can also see that the elements in self Array remain unchanged because this method is one of the examples of the non-destructive methods.

在上面的代碼中，您可以觀察到借助Array.shuffle方法 ，我們正在對Array實例中的元素進行改組 。 您可以觀察到，在兩次運行中，由于元素的改組始終是隨機的，因此輸出或生成的Array實例是不同的。 您還可以看到self Array中的元素保持不變，因為此方法是非破壞性方法的示例之一。

Example 2:

范例2：

=begin
Ruby program to demonstrate shuffle method
=end
# array declaration
table = [2,4,6,8,10,12,14,16,18,20]
puts "Array shuffle implementation"
pq = table.shuffle(random: Random.new(2))
puts "Array instance after shuffling: #{pq}"
puts "Array instance:"
print table 

Output

輸出量

RUN 1:
Array shuffle implementation
Array instance after shuffling: [10, 4, 12, 2, 16, 6, 8, 14, 20, 18]
Array instance:
[2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
RUN 2:
Array shuffle implementation
Array instance after shuffling: [10, 4, 12, 2, 16, 6, 8, 14, 20, 18]
Array instance:
[2, 4, 6, 8, 10, 12, 14, 16, 18, 20]

Explanation:

說明：

In the above code, you can observe that we are shuffling the elements of the Array instance with the help of Array.shuffle method. We are passing an argument inside the method in order to generate a random number. This helps you in the way that it makes the shuffling constant. In both the runs, you can observe that the returning Array is constant. This method is a non-destructive method that is why it is not creating any changes in the actual array instance.

在上面的代碼中，您可以觀察到我們正在借助Array.shuffle方法對Array實例的元素進行混洗 。 我們在方法內部傳遞參數以生成隨機數。 這以使改組為常數的方式幫助您。 在這兩次運行中，您都可以觀察到返回的Array是常量。 此方法是一種非破壞性方法，這就是為什么它不會在實際的數組實例中創建任何更改的原因。

翻譯自: https://www.includehelp.com/ruby/array-shuffle-method-with-example.aspx

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