Ruby Exceptions

Syntax

begin
  risky_work
rescue StandardError => error
  puts error.message
end

Examples

begin
  age = Integer("not a number")
rescue ArgumentError => error
  puts "Please enter a number: #{error.message}"
end

Best practices

• Rescue specific exception classes when possible so unexpected failures are not silently hidden.
• Keep examples small while learning, then combine the idea with a real project.

At a glance

Purpose

Expressive scripting and applications

File extension

.rb

Runs in

Ruby interpreter

Usually used with

Ruby standard library and gems

Specifications & further reading

• Ruby documentation

Related Ruby documentation