Inside Ruby’s Range: A Tour Through range.c

May 18, 2026

Most Ruby developers use ranges every day:

(1..5)
('a'..'z')
(1...)
(..10)

They feel lightweight, expressive, and almost deceptively simple.

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But under the hood, Ruby’s Range implementation is one of the most optimized and feature-rich parts of CRuby.

Inside range.c, the Ruby core team handles:

• endless ranges
• beginless ranges
• arithmetic sequences
• binary search
• Fixnum optimizations
• Bignum overflow
• float stepping
• string iteration
• symbol iteration
• enumerator integration

All behind a syntax most developers learn on day one.

Let’s open the hood.

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Inside Ruby’s Range: A Tour Through range.c – Linking Ruby knowledge from the most remote places in the world.

May 18, 2026 Most Ruby developers use ranges every day: (1..5) ('a'..'z') (1…) (..10) They feel lightweight, expressive, and almost deceptively simple. Built for Ruby on R…

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