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How to initialize array in Ruby
  • Last Updated : 24 Oct, 2019

In this article, we will learn how to initialize the array in Ruby. There are several ways to create an array. Let’s see each of them one by one.

Using the new class method:

new method can be used to create the arrays with the help of dot operator. Using arguments we can provide the size to array and elements to array.

Without any argument –




# creating array using new method  
# without passing any parameter 
arr = Array.new() 
  
# displaying the size of arrays 
# using size method 
puts arr.size 


Output:

0

Passing size of array as parameter –






# creating array using new method  
# passing one parameter i.e. the  
# size of array 
arr2 = Array.new(7
  
# displaying the length of arrays 
# using length method  
puts arr2.length 


Output:

7

Passing size of array and elements as parameter –




# creating array using new method  
# passing two parameters i.e. the  
# size of array & element of array 
arr3 = Array.new(4, "GFG"
  
puts "#{arr3}"


Output:

["GFG", "GFG", "GFG", "GFG"]

Using literal constructor[] –

In Ruby, [] is known as the literal constructor which can be used to create the arrays.




# Ruby program to demonstrate the  
# creation of array using literal  
# constructor[] and to find the size  
# and length of array 
    
# creating array of characters 
arr = Array['a', 'b', 'c', 'd', 'e', 'f'
    
# displaying array elements 
puts "#{arr}"
    
# displaying array size 
puts "Size of arr is: #{arr.size}"
    
# displaying array length 
puts "Length of arr is: #{arr.length}"


Output:

["a", "b", "c", "d", "e", "f"]
[1, 2, 3, 4, 5, 6, 7]
Size of arr is: 6
Length of arr is: 6

Using range –




arr1 = ('1'..'6').to_a  
# displaying array elements 
puts "#{arr1}"
  
arr2 = *'11'..'15'
puts "#{arr2}"


Output:

["1", "2", "3", "4", "5", "6"]
["11", "12", "13", "14", "15"]
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