Useful Array and Hash Methods

Ruby provides many useful methods to work with Arrays and Hashes efficiently.

In this lesson, you will explore methods like compact, flatten, merge, sort, and keys.

Using Compact

The compact method removes nil values from an array.

numbers = [1, nil, 2, nil, 3]
puts numbers.compact

Using Flatten

The flatten method converts nested arrays into a single array.

nested_array = [[1, 2], [3, 4], [5, 6]]
puts nested_array.flatten

Using Merge

The merge method combines two hashes.

hash1 = {a: 1, b: 2}
hash2 = {b: 3, c: 4}
puts hash1.merge(hash2)

Using Sort

The sort method arranges elements in ascending order.

numbers = [5, 3, 8, 1, 2]
puts numbers.sort

Using Reverse

The reverse method reverses the order of elements in an array.

numbers = [1, 2, 3, 4, 5]
puts numbers.reverse

Using Keys

The keys method returns all keys from a hash.

person = {name: 'Alice', age: 25, city: 'New York'}
puts person.keys

Using Values

The values method returns all values from a hash.

person = {name: 'Alice', age: 25, city: 'New York'}
puts person.values

Congratulations!

You have learned useful array and hash methods in Ruby.

Next, you will explore object-oriented programming concepts in Ruby.