ruby array_Ruby中带有示例的Array.shuffle方法

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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，我们将研究Array.shuffle方法 。 大家都必须认为该方法必须执行与Array实例中的元素或对象的改组有关的操作。 它并不像看起来那么简单。 好吧，我们将在其余内容中解决这个问题。 我们将尝试借助语法并演示程序代码来理解它。

Method description:

方法说明：

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.

该方法是一个公共实例方法，为Ruby库中的Array类定义。 该方法的工作方式是随机地对Array实例中存在的对象进行洗牌。 此方法的返回类型是一个Array对象，它以随机的方式包含self的所有元素。 您还可以提供一个可选参数rng ，可用作随机数生成器。 此方法是非破坏性方法的示例之一，这意味着此方法创建的更改不是永久的或临时的，并且不会影响self Array实例中元素的实际排列。

Syntax:

句法：

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

Argument(s) required:

所需参数：

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

此方法采用一个可选参数。 此参数可用于生成随机数 。

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

输出量

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:

说明：

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.

在上面的代码中，您可以观察到借助Array.shuffle方法 ，我们正在对Array实例中的元素进行改组 。 您可以观察到，在两次运行中，由于元素的改组始终是随机的，因此输出或生成的Array实例是不同的。 您还可以看到self Array中的元素保持不变，因为此方法是非破坏性方法的示例之一。

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

输出量

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:

说明：

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.

在上面的代码中，您可以观察到我们正在借助Array.shuffle方法对Array实例的元素进行混洗 。 我们在方法内部传递参数以生成随机数。 这以使改组为常数的方式帮助您。 在这两次运行中，您都可以观察到返回的Array是常量。 此方法是一种非破坏性方法，这就是为什么它不会在实际的数组实例中创建任何更改的原因。

翻译自: https://www.includehelp.com/ruby/array-shuffle-method-with-example.aspx

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