Ruby | Array assoc() function

Last Updated : 09 Jan, 2020

The assoc() function in Ruby is used to search through an array of arrays whose first element is compared with the index of the function and return the contained array if match found otherwise return either nil or vacant.

Syntax: Array.assoc(Object)
Here Array is the array of arrays.

Parameters:
Object : It is an element which gets compared with the first element of the contained array.

Returns: the contained array if match found otherwise returns either nil or vacant.

Example 1:

# Initializing a array of elements 
Array1 = ["Alphabets", "a", "b", "c", "d", "e"] 
Array2 = ["Names", "gfg", "Geeks", "Geek", "GeeksforGeeks"] 
Array3 = ["City", "Kolkata", "Mumbai", "Delhi", "Patna"] 
  
# Creating an array of above arrays 
Array = [Array1, Array2, Array3] 
  
# Calling assoc() function 
A = Array.assoc("Alphabets") 
B = Array.assoc("City") 
C = Array.assoc("Names") 
  
# Printing the matched contained array 
puts "#{A}"
puts "#{B}"
puts "#{C}"

Output:

["Alphabets", "a", "b", "c", "d", "e"]
["City", "Kolkata", "Mumbai", "Delhi", "Patna"]
["Names", "gfg", "Geeks", "Geek", "GeeksforGeeks"]

Example 2:

# Initializing a array of elements 
Array1 = ["Alphabets", "a", "b", "c", "d", "e"] 
Array2 = ["Names"] 
Array3 = "City"
  
# Creating an array of above arrays 
Array = [Array1, Array2, Array3] 
  
# Calling assoc() function 
A = Array.assoc("Alphabets") 
B = Array.assoc("City") 
C = Array.assoc("Names") 
  
# Printing the matched contained array 
puts "#{A}"
puts "#{B}"
puts "#{C}"

Output:

["Alphabets", "a", "b", "c", "d", "e"]

["Names"]

Reference: https://devdocs.io/ruby~2.5/array#method-i-assoc

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