Streams

Posts

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  09/02/2026

  Grouping and summarizing a list in modern Java

  Collectors.groupingBy with a downstream collector replaces most of the loop-and-map code people still write - plus records, which remove the class that loop needed.

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  09/02/2026

  Reading a huge file line by line in Node, without loading it

  readFileSync on a 2GB log is how a Node process dies. Streaming it line by line uses a constant few kilobytes instead, and is barely more code.