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Re:Map.merge() – One method to rule them all by vbsteven on Sunday March 31, 2019 @12:03PM (#19536282)
I know these functional concepts are far from new.

I use "modern" in this context because other contemporary languages like Python/Ruby/Scala/Rust etc all have versions of those and FP-style collection usage using these names has become popular in the last 10 years.

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