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Frozen String Literals in Ruby 3.4

December 16, 2024

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Your Teacher

Hi, I'm Chris. I'm the creator of GoRails, Hatchbox.io and Jumpstart. I spend my time creating tutorials and tools to help Ruby on Rails developers build apps better and faster.

About This Episode

Ruby 3.4 now raises warnings anytime you mutate a string literal. Learn how to fix our code and use frozen string literals to improve performance.

Notes

How to handle Frozen String Literals

"Chris" << " Oliver" #=> Will raise a deprecation warning or error

Instead, we want to create mutable strings:

# Using the unary operator to create a UTF8 string
+"Chris" << " Oliver"

# Or String.new to create a ASCII-8BIT string
String.new

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