Type Signatures — Functional Programming for JavaScript Developers

Jan-Vidar Tandberg Bakke
Level Up Coding
Published in
8 min readFeb 25, 2020

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Wouldn’t it be nice if there was a way to reason about each other’s code, without having to understand every single line? What if there where a system that was common for all Functional Programmers? It seems too good to be true?

In this article, we will expore the Hindley-Milner type system. A system to help you write simple comments above your…

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