Ruby String Case Conversion – Built-in Methods Guide
Published 2026-03-03 · convertcase.in
Ruby's String class includes intuitive case conversion methods. Here's a complete reference with examples.
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1Ruby Case Methods
"hello".upcase → "HELLO" "HELLO".downcase → "hello" "hello world".capitalize → "Hello world" "Hello World".swapcase → "hELLO wORLD"
2Title Case in Ruby
No built-in title case. Use: str.split.map(&:capitalize).join(" ") — note this capitalises ALL words including "and", "the".Frequently Asked Questions
Is Ruby's capitalize the same as sentence case?
Partially — capitalize only affects the first character of the whole string, not each sentence.