How to Convert a Map to an Array of Key-Value Pairs in Ruby

How to Convert a Map to an Array of Key-Value Pairs in Ruby ?

Answer

To convert a hash to an array of key-value pairs in Ruby, you can use the to_a method. This method returns an array of all key-value pairs in the hash.

✐ Examples

1 Converting a Hash to an Array of Key-Value Pairs Using to_a Method

We can convert a hash to an array of key-value pairs in Ruby using the to_a method, which provides an array of all key-value pairs in the hash.

For example,

We start by declaring and initializing a hash named my_hash with some key-value pairs. In this example, the hash has string keys and integer values.
We use the to_a method to get an array of the key-value pairs in the hash.
We store the array of key-value pairs in a variable named key_value_pairs.
We print the key-value pairs to the console using the puts function to verify the conversion.

Ruby Program

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

# Convert hash to an array of key-value pairs
key_value_pairs = my_hash.to_a

# Print the key-value pairs
puts "Key-Value Pairs: #{key_value_pairs}"

Output

Key-Value Pairs: [["one", 1], ["two", 2], ["three", 3]]

2 Converting an Empty Hash to an Array of Key-Value Pairs

We can also convert an empty hash to an array of key-value pairs in Ruby using the to_a method, which returns an empty array when the hash is empty.

For example,

We start by declaring an empty hash named empty_hash with string keys and integer values.
We use the to_a method to get an array of the key-value pairs in the empty hash.
We store the array of key-value pairs in a variable named empty_key_value_pairs.
We print the key-value pairs to the console using the puts function to verify that the array is empty.

Ruby Program

empty_hash = {}

# Convert empty hash to an array of key-value pairs
empty_key_value_pairs = empty_hash.to_a

# Print the key-value pairs
puts "Key-Value Pairs: #{empty_key_value_pairs}"

Output

Key-Value Pairs: []

3 Converting a Hash to an Array of Key-Value Pairs After Adding Elements

We can convert a hash to an array of key-value pairs in Ruby after adding elements using the to_a method, which provides an updated array of all key-value pairs in the hash.

For example,

We start by declaring an empty hash named dynamic_hash with string keys and integer values.
We add some key-value pairs to the hash using the hash's index notation.
We use the to_a method to get an array of the key-value pairs in the hash after adding elements.
We store the array of key-value pairs in a variable named dynamic_key_value_pairs.
We print the key-value pairs to the console using the puts function to verify the updated list of key-value pairs.

Ruby Program

dynamic_hash = {}

# Add elements to the hash
dynamic_hash['one'] = 1
dynamic_hash['two'] = 2
dynamic_hash['three'] = 3

# Convert hash to an array of key-value pairs after adding elements
dynamic_key_value_pairs = dynamic_hash.to_a

# Print the key-value pairs
puts "Key-Value Pairs: #{dynamic_key_value_pairs}"

Output

Key-Value Pairs: [["one", 1], ["two", 2], ["three", 3]]

Summary

In this tutorial, we learned How to Convert a Map to an Array of Key-Value Pairs in Ruby language with well detailed examples.

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