How to Use puts in Ruby: Simple Output Guide

puts in Ruby is used to print text or values to the console followed by a new line. You simply write puts followed by the text or variable you want to display inside quotes or without quotes for variables.

Syntax

The basic syntax of puts is simple:

• puts "text": Prints the text with a new line.
• puts variable: Prints the value of a variable with a new line.
• puts expression: Prints the result of an expression.

ruby

puts "Hello, world!"
puts 123
puts 5 + 3

Output

Hello, world!
123
8

Example

This example shows how puts prints strings, numbers, and expressions to the console, each on its own line.

ruby

name = "Alice"
age = 30
puts "Name: " + name
puts "Age: #{age}"
puts age + 5

Output

Name: Alice
Age: 30
35

Common Pitfalls

One common mistake is forgetting that puts adds a new line after printing, which can affect formatting. Another is using puts with variables without converting them to strings when concatenating, which causes errors.

Use string interpolation "#{variable}" or separate arguments with commas to avoid errors.

ruby

puts "Age: " + age.to_s  # This avoids error by converting age to string
puts "Age: #{age}"  # Correct way using interpolation
puts "Age:", age    # Correct way using comma

Output

Age: 30
Age: 30
Age: 30

Quick Reference

Usage	Description
puts "text"	Prints text with a new line
puts variable	Prints variable value with a new line
puts expression	Prints result of expression with a new line
puts "#{variable}"	Prints variable inside a string using interpolation
puts arg1, arg2	Prints multiple arguments separated by spaces, each followed by a new line

Key Takeaways

Use puts to print text or values followed by a new line in Ruby.

String interpolation "#{variable}" helps print variables inside strings safely.

Avoid concatenating strings and numbers directly; use interpolation or commas instead.

puts automatically adds a new line after each output.

You can print multiple items by separating them with commas in puts.