How to create a Map with Initial Key-Value Pairs in Ruby

How to create a Map with Initial Key-Value Pairs in Ruby ?

Answer

To create a map with initial key-value pairs in Ruby, you can use the hash literal syntax. This creates a new hash object with predefined key-value pairs.

✐ Examples

1 Creating a Map with Initial Key-Value Pairs Using Hash Literal

We can create a map in Ruby with initial key-value pairs using the hash literal syntax, which initializes a map with predefined key-value pairs.

For example,

We start by declaring a variable named my_map. This variable will hold our map with initial key-value pairs.
We use the hash literal syntax to create a new hash object. In Ruby, the hash literal syntax allows us to specify key-value pairs directly within curly braces.
The newly created map is now assigned to the my_map variable. In this example, the map has string keys and integer values.
We can now perform various operations on this map, such as adding more key-value pairs, checking for the presence of keys, and retrieving values.

Ruby Program

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

# Operations on the map
my_map.each do |key, value|
  puts "#{key}: #{value}"
end

Output

one: 1
two: 2
three: 3

2 Creating a Map with Different Key-Value Types

We can create a map in Ruby with initial key-value pairs of different types using the hash literal syntax.

For example,

We start by declaring a variable named student_grades. This variable will hold our map with initial key-value pairs where keys are strings (student names) and values are characters (grades).
We use the hash literal syntax to create a new hash object. In Ruby, the hash literal syntax allows us to specify key-value pairs directly within curly braces.
The newly created map is now assigned to the student_grades variable. In this example, the map has string keys and string values representing grades.
We can now perform various operations on this map, such as adding more key-value pairs, checking for the presence of keys, and retrieving values.

Ruby Program

student_grades = {
    'Alice' => 'A',
    'Bob' => 'B',
    'Charlie' => 'C'
}

# Operations on the map
student_grades.each do |key, value|
  puts "#{key}: #{value}"
end

Output

Alice: A
Bob: B
Charlie: C

3 Creating a Map with Integer Keys and Float Values

We can create a map in Ruby with initial key-value pairs where keys are integers and values are floats using the hash literal syntax.

For example,

We start by declaring a variable named product_prices. This variable will hold our map with initial key-value pairs where keys are integers (product IDs) and values are floats (prices).
We use the hash literal syntax to create a new hash object. In Ruby, the hash literal syntax allows us to specify key-value pairs directly within curly braces.
The newly created map is now assigned to the product_prices variable. In this example, the map has integer keys and float values.
We can now perform various operations on this map, such as adding more key-value pairs, checking for the presence of keys, and retrieving values.

Ruby Program

product_prices = {
    101 => 29.99,
    102 => 39.99,
    103 => 49.99
}

# Operations on the map
product_prices.each do |key, value|
  puts "Product #{key}: $#{value}"
end

Output

Product 101: $29.99
Product 102: $39.99
Product 103: $49.99

Summary

In this tutorial, we learned How to create a Map with Initial Key-Value Pairs in Ruby language with well detailed examples.

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