Built-in Functions in Ruby Language

Ruby is a versatile and expressive programming language that provides a wide range of built-in functions (also

known as methods or functions) to make developers’ lives easier. These built-in functions are part of Ruby’s standard library and cover a variety of tasks, from basic operations to more advanced functionalities. In this post, we’ll explore some of the most commonly used built-in functions in Ruby and provide examples of how they can be used.

puts

The puts method is used to print a string or variable to the console with a newline character at the end. It’s commonly used for output in Ruby programs.

puts "Hello, World!"

gets

The gets method is used to read input from the user via the console. It reads a line of text and returns it as a string.

print "Enter your name: "
name = gets.chomp
puts "Hello, #{name}!"

length

The length method is used to find the length of a string, array, or other enumerable objects.

string = "Ruby is fun!"
puts "Length of the string: #{string.length}"

to_s, to_i, to_f

These methods are used for type conversion. to_s converts an object to a string, to_i to an integer, and to_f to a floating-point number.

num = 42
puts num.to_s
str = "3.14"
puts str.to_f

split

The split method splits a string into an array of substrings based on a delimiter.

sentence = "Ruby is a beautiful language"
words = sentence.split(" ")
puts words

join

The join method combines the elements of an array into a single string, separated by a specified delimiter.

colors = ["red", "green", "blue"]
combined = colors.join(", ")
puts combined

each

The each method is used for iterating over elements in an array or other enumerable objects.

fruits = ["apple", "banana", "cherry"]
fruits.each do |fruit|
  puts "I love #{fruit}s!"
end

map

The map method applies a block of code to each element in an array and returns a new array with the results.

numbers = [1, 2, 3, 4, 5]
squared_numbers = numbers.map { |n| n * n }
puts squared_numbers

include?

The include? method checks if an array or string includes a specific element or substring.

colors = ["red", "green", "blue"]
puts colors.include?("green") # true

sort

The sort method arranges elements in an array in ascending order.

numbers = [5, 2, 8, 1, 9]
sorted_numbers = numbers.sort
puts sorted_numbers

These are just a few examples of the many built-in functions available in Ruby. Understanding these functions and how to use them effectively can greatly simplify your Ruby programming tasks. As you explore Ruby further, you’ll discover many more useful built-in functions that can help you write efficient and expressive code.