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When working with huge or infinite collections in Ruby, eager methods build full arrays and can exhaust memory. Ruby’s Enumerator::Lazy defers operations until a terminal call, letting you safely iterate millions of items. This blog shows how to use it, when it pays off, and what pitfalls to avoid.
When processing large datasets in Ruby, the choice between immediate array mapping and lazy evaluation significantly impacts memory consumption. Using Array#map immediately materializes a complete new array in memory before any subsequent operations are performed. This can lead to high RSS usage if the source collection is large and only a subset is eventual
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