It's correct as a noun. I believe it's taken from math: https://en.wikipedia.org... | Hacker News

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dataflow on Sept 11, 2018 | parent | context | favorite | on: Why Y? Deriving the Y Combinator in JavaScript

It's correct as a noun. I believe it's taken from math: https://en.wikipedia.org/wiki/Functional_(mathematics)

The CS term is "higher-order function": https://en.wikipedia.org/wiki/Higher-order_function

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