iter.Seq in Go 1.23+: The Iterator Type Behind range-over-func

📰 Dev.to · Gabriel Anhaia

Learn about iter.Seq in Go 1.23+, a new iterator type that enables custom iterators and simplifies range-over-func, and how to apply it in various scenarios

intermediate Published 5 May 2026
Action Steps
  1. Create a custom iterator using iter.Seq[V]
  2. Use iter.Seq to simplify range-over-func in your Go code
  3. Apply iter.Seq to the slices/maps ecosystem for more efficient data processing
  4. Implement a paginated client using iter.Seq for better data handling
  5. Build a filter+map+take pipeline with iter.Seq for streamlined data processing
Who Needs to Know This

Software engineers and developers working with Go can benefit from this knowledge to improve their coding efficiency and create more robust iterators

Key Insight

💡 iter.Seq is a powerful new iterator type in Go that can be used to create custom iterators and improve data processing efficiency

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🚀 iter.Seq in Go 1.23+ simplifies range-over-func and enables custom iterators! 🤩

Key Takeaways

Learn about iter.Seq in Go 1.23+, a new iterator type that enables custom iterators and simplifies range-over-func, and how to apply it in various scenarios

Full Article

iter.Seq[V] is the API. Custom iterators, the slices/maps ecosystem, a paginated client, and a filter+map+take pipeline.
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