Ruby: Documentation Lookup, Using Builtin Help System

By Xah Lee. Date: . Last updated: .

In terminal, type ri --help to get started.

Type ri to enter the help system, then you can type any class or method name.

If you have a question, put $5 at patreon and message me.

  1. Ruby Basics
  2. Doc Lookup
  3. Print Version String
  4. What's RVM, Gem, Rake, Bundler, RDoc, ri, irb?

  1. Unicode 💎
  2. Quote String
  3. Quote Long String
  4. Format String
  5. String Operations
  6. True, False
  7. “if then else”
  8. for, while, Loop
  9. List
  10. Loop Thru List
  11. Hash Table
  12. Function Optional Parameter
  13. Map f to List
  14. Complex Numbers
  1. Intro to Reading Ruby Doc: What's M, C, ::, # ?
  2. Predefined Global Variables