How to Check if Two Maps are Equal in Ruby

How to Check if Two Maps are Equal in Ruby ?

Answer

To check if two hashes are equal in Ruby, you can use the `==` operator, which compares the key-value pairs of both hashes. This method provides a straightforward way to determine if two hashes contain the same elements.

✐ Examples

1 Checking Equality of Two Hashes Using the == Operator

We can check if two hashes are equal in Ruby by using the `==` operator, which compares their key-value pairs.

For example,

We start by declaring and initializing two hashes named hash1 and hash2 with some key-value pairs. In this example, the hashes have string keys and integer values.
We use an if statement to compare hash1 and hash2 using the `==` operator.
We print the result to the console using the puts function to indicate whether the hashes are equal or not.

Ruby Program

hash1 = { 'one' => 1, 'two' => 2, 'three' => 3 }
hash2 = { 'one' => 1, 'two' => 2, 'three' => 3 }

# Check if the hashes are equal
if hash1 == hash2
  puts 'Hashes are equal'
else
  puts 'Hashes are not equal'
end

Output

Hashes are equal

2 Checking Equality of Two Hashes with Different Sizes

We can also check if two hashes with different sizes are equal in Ruby by comparing their sizes first and then using the `==` operator to compare their key-value pairs.

For example,

We start by declaring and initializing two hashes named hash1 and hash2 with some key-value pairs. In this example, the hashes have string keys and integer values, and they have different sizes.
We use an if statement to compare the sizes of hash1 and hash2. If their sizes are not equal, we print a message indicating that the hashes are not equal.
If their sizes are equal, we use the `==` operator to compare the key-value pairs of both hashes.
We print the result to the console using the puts function to indicate whether the hashes are equal or not.

Ruby Program

hash1 = { 'one' => 1, 'two' => 2, 'three' => 3 }
hash2 = { 'one' => 1, 'two' => 2 }

# Check if the hashes are equal
if hash1.size != hash2.size
  puts 'Hashes are not equal'
elsif hash1 == hash2
  puts 'Hashes are equal'
else
  puts 'Hashes are not equal'
end

Output

Hashes are not equal

3 Checking Equality of Two Hashes Using a Helper Function

We can create a helper function to check if two hashes are equal in Ruby, which provides a reusable way to compare hashes.

For example,

We start by declaring and initializing two hashes named hash1 and hash2 with some key-value pairs. In this example, the hashes have string keys and integer values.
We define a helper function named are_hashes_equal that takes two hashes as parameters and returns a boolean value indicating whether the hashes are equal.
Inside the helper function, we compare the sizes of the hashes. If their sizes are not equal, we return false.
If their sizes are equal, we use the `==` operator to compare the key-value pairs of both hashes and return the result.
We call the helper function with hash1 and hash2 as arguments and print the result to the console using the puts function to indicate whether the hashes are equal or not.

Ruby Program

hash1 = { 'one' => 1, 'two' => 2, 'three' => 3 }
hash2 = { 'one' => 1, 'two' => 2, 'three' => 3 }

# Helper function to check if two hashes are equal
def are_hashes_equal(hash1, hash2)
  return false if hash1.size != hash2.size
  hash1 == hash2
end

# Check if the hashes are equal using the helper function
if are_hashes_equal(hash1, hash2)
  puts 'Hashes are equal'
else
  puts 'Hashes are not equal'
end

Output

Hashes are equal

Summary

In this tutorial, we learned How to Check if Two Maps are Equal in Ruby language with well detailed examples.

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