assoc_Ruby assoc（）函数

本是古典何须时尚 2023-03-05 08:30 181阅读 0赞

assoc

## Ruby中的assoc()函数 **(**assoc() function in Ruby**)** ##

We have studied functions to process [single dimensional array][] so far but if we talk about **assoc() function**, it does not work for single dimensional arrays. **assoc() function** only works on Array of Arrays or you can say that it works on multidimensional arrays. The purpose of the **assoc() function** is to check the first element of each array. It processes array by checking the first element of the array with the specified index element, if the element is found then the whole array is returned otherwise the function returns nil or vacant.

到目前为止，我们已经研究了处理[一维数组的][single dimensional array]函数，但是如果我们谈论**assoc()函数** ，则该**函数**不适用于一维数组。 **assoc()函数**仅适用于数组数组，或者可以说它适用于多维数组。 **assoc()函数**的目的是检查每个数组的第一个元素。 它通过使用指定的索引元素检查数组的第一个元素来处理数组，如果找到该元素，则返回整个数组，否则该函数返回nil或vacant。

**Syntax:**

**句法：**

Array_name.assoc(Object)

Now, let us understand the implementation of **assoc() function** with the help of examples broadly,

现在，让我们借助示例广泛地理解**assoc()函数**的实现，

**Example 1:**

**范例1：**

=begin
    Ruby program to demonstrate implementation of assoc() function
    =end
    
    # Initializing multiple arrays of elements 
    Arr1 = ["Fruits", "banana", "apple", "orange", "kiwi", "apricot", "Pineapple"] 
    Arr2 = ["Languages", "C#", "Java", "Ruby", "Python", "C++","C"] 
    Arr3 = ["Colors", "Red", "Brown", "Green", "Pink", "Yellow", "Teal"]
    Arr4 = ["Vegetables", "Brinjal", "Tomato", "Potato", "Reddish"] 
    
    # Creating a final array of above arrays 
    FinalArray = [Arr1, Arr2, Arr3, Arr4] 
    
    # Invoking assoc() function 
    A1 = FinalArray.assoc("Fruits") 
    A2 = FinalArray.assoc("Languages") 
    A3 = FinalArray.assoc("Colors")
    A4 = FinalArray.assoc("Vegetables") 
    
    # Printing the matched contained array 
    puts "#{A1}"
    puts "#{A2}"
    puts "#{A3}"
    puts "#{A4}"

**Output**

**输出量**

["Fruits", "banana", "apple", "orange", "kiwi", "apricot", "Pineapple"]
    ["Languages", "C#", "Java", "Ruby", "Python", "C++", "C"]
    ["Colors", "Red", "Brown", "Green", "Pink", "Yellow", "Teal"]
    ["Vegetables", "Brinjal", "Tomato", "Potato", "Reddish"]

**Code logic:**

**代码逻辑：**

In the above example, we have initialized four arrays along with their categories as the first element of the array. Finalarray is storing these arrays as its elements. When the **assoc() function** is invoked with the element as an index, then the element is compared with the first element of each array. Arrays A1, A2, A3, and A4 are storing the contained array.

在上面的示例中，我们初始化了四个数组及其类别，作为数组的第一个元素。 Finalarray将这些数组作为元素存储。 当使用该元素作为索引调用**assoc()函数时** ，该元素将与每个数组的第一个元素进行比较。 数组A1，A2，A3和A4正在存储包含的数组。

**Example 2:**

**范例2：**

=begin
    Ruby program to demonstrate implementation of assoc() function
    =end
    
    # Initializing multiple arrays of elements 
    Arr1 = ["Fruits", "banana", "apple", "orange", "kiwi", "apricot","Pineapple"] 
    Arr2 = ["Languages", "C#", "Java", "Ruby", "Python","C++","C"] 
    Arr3 = ["Colors", "Red", "Brown", "Green", "Pink","Yellow","Teal"]
    Arr4 = ["Vegetables", "Brinjal", "Tomato", "Potato", "Raddish"] 
    
    # Creating a final array of above arrays 
    FinalArray = [Arr1, Arr2, Arr3, Arr4] 
    
    # Taking input from user.
    puts "Enter the catagory:-"
    cat = gets.chomp
    arr = FinalArray.assoc(cat)
    if (arr==nil)
    	puts "category not available"
    else
    	puts "The available elements under the category is:-"
    puts "#{arr}"
    end

**Output**

**输出量**

Run 1:-
    Enter the category:-
    Colors
    The available elements under the category is:-
    ["Colors", "Red", "Brown", "Green", "Pink", "Yellow", "Teal"]
    
    Run 2:-
    Enter the category:-
    Cars
    category not available
    
    Run 3:-
    Enter the category:-
    Fruits
    The available elements under the category is:-
    ["Fruits", "banana", "apple", "orange", "kiwi", "apricot", "Pineapple"]

**Code logic:**

**代码逻辑：**

In this example, we have declared four arrays and then the final array. We are taking category as input from the user. We are passing that category to the **assoc() function**. If the category matches, the array is stored in the contained array otherwise **assoc()** is returning nil.

在此示例中，我们声明了四个数组，然后声明了最后一个数组。 我们将类别作为用户的输入。 我们将该类别传递给**assoc()函数** 。 如果类别匹配，则将数组存储在包含的数组中，否则**assoc()**返回nil。

> 翻译自: [https://www.includehelp.com/ruby/assoc-function.aspx][https_www.includehelp.com_ruby_assoc-function.aspx]

assoc

[single dimensional array]: https://www.includehelp.com/ruby/arrays.aspx
[https_www.includehelp.com_ruby_assoc-function.aspx]: https://www.includehelp.com/ruby/assoc-function.aspx