Ruby assoc()函数
assoc()Ruby中的功能
到目前为止，我们已经研究了处理一维数组的assoc()函数，但是如果我们谈论函数，则它不适用于一维数组。assoc()函数仅适用于数组数组，或者可以说它适用于多维数组。该assoc()方法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。
语法：
Array_name.assoc(Object)
现在，让我们借助示例广泛地了解assoc()函数的实现，
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}"输出结果
["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"]
代码逻辑：
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将这些数组存储为其元素。当使用元素作为索引调用assoc()函数时，会将元素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。
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"]
# 创建上面数组的最终数组
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输出结果
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"]
代码逻辑：
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。我们正在将该类别传递给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。