Ruby 3.4 Frozen String Literals: What Rails Developers Need to Know

Re:Ruby 3.4 Frozen String Literals: What Rails Developers Ne... by tangus on Wednesday July 09, 2025 @10:19AM (#44510375)

Even if it didn't dedupe strings, mutable string literals means that it has to create a new string every time it encounters a literal in run time. If you have a literal string in a method, every time you call the method a new string is created. If you have one inside a loop, every iteration a new string is created. You get the idea.

With immutable strings literals, string literals can be reused.

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Re:Ruby 3.4 Frozen String Literals: What Rails Developers Ne... by hinkley on Wednesday July 09, 2025 @12:56PM (#44512308)

Here’s a more concrete example:

You make an arrow function that takes an object as input, and calls another with a string and a field from the object, for instance to populate a lookup table. You probably don’t want someone changing map keys out from under you, because you’ll break resize. So copies are being made to ensure this?

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