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Hash.insert() Method with Example in Ruby

Ruby Hash.insert() Method: Here, we are going to learn about the Hash.insert() Method with examples in Ruby programming language.
Submitted by Hrithik Chandra Prasad, on March 01, 2020

Hash.insert() Method

In this article, we will study about Hash.insert() Method. You all must be thinking the method must be doing something which is related to the insertion of certain element. It is not as simple as it looks. Well, we will figure this out in the rest of our content. We will try to understand it with the help of syntax and demonstrating program codes.

Method description:

This method is one of the examples of the Public instance method which is specially defined in the Ruby library for Array class. This method works in the way that it inserts the object before the element with the given index. If you provide the negative index then it will count the index from the backward of the Array instance. This method is one of the examples of destructive methods where the changes made by these methods are permanent. There is no non-destructive version of this method.

Syntax:

    Array_instance.insert(index,object)

Argument(s) required:

This method accepts two arguments. The first one is the index where you want to insert the object of any class and the second word is the String having the name of the object. These two arguments are mandatory as their absence will make you see Exception. The number of arguments can be more as well but can never be less than 2.

Example 1:

=begin
  Ruby program to demonstrate insert method
=end	

lang = ["C++","Java","Python","Ruby","Perl"]

puts "Array insert implementation."

puts "Enter the index where you want to insert:"
ind = gets.chomp.to_i

puts "Enter the object which you want to insert:"
ele = gets.chomp

if(ind = lang.insert(ind,ele))
	puts "Object inserted properly"
else
	puts "Error in inserting object"
end

puts "Array elements are:"
print lang

Output

Array insert implementation.
Enter the index where you want to insert:
 2
Enter the object which you want to insert:
 HTML
Object inserted properly
Array elements are:
["C++", "Java", "HTML", "Python", "Ruby", "Perl"]

Explanation:

In the above code, you can observe that we have asked the user for the index where she wants to insert the object and the name of the object. In the last part of output where the whole Array object is printed, you can observe that we have "HTML" at that index only.

Example 2:

=begin
  Ruby program to demonstrate insert method
=end	

lang = ["C++","Java","Python","Ruby","Perl"]

puts "Array insert implementation."

puts "Enter the  first index where you want to insert:"
ind1 = gets.chomp.to_i

puts "Enter the first object which you want to insert:"
ele1 = gets.chomp

puts "Enter the  second object where you want to insert:"
ele2 = gets.chomp

puts "Enter the third object which you want to insert:"
ele3 = gets.chomp

if(ind = lang.insert(ind1,ele1,ele2,ele3))
	puts "Object inserted properly"
else
	puts "Error in inserting object"
end

puts "Array elements are:"
print lang

Output

Array insert implementation.
Enter the  first index where you want to insert:
 2
Enter the first object which you want to insert:
 Java
Enter the  second object where you want to insert:
 Javascript
Enter the third object which you want to insert:
 COBOL
Object inserted properly
Array elements are:
["C++", "Java", "Java", "Javascript", "COBOL", "Python", "Ruby", "Perl"]

Explanation:

In the above code, you can see that we inserting several elements at the same time in the Array instance. We have asked the user for the index from where she wants to start inserting the objects. The first object is inserted at that location and others are inserted at the consecutive locations.