How to iterate over a Hash in Ruby?

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:

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:

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"]

How to iterate over a Hash in Ruby?

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