March 2021
Intermediate to advanced
360 pages
9h 56m
English
Content preview from The Joy of JavaScript
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5 Higher-kinded composition
This chapter covers
- Transforming arrays and objects safely with
mapandflatMap - Composable design patterns with algebraic data types
- Writing a
Validationdata type to remove complex branching logic - Chaining ADTs using the new bind operator (
::)
The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.
—Edgar Dijkstra
In chapter 4, you learned how function composition leads to fluent, compact, and declarative code when you use compose to chain your function’s inputs and outputs as data passes through them. Composition has a lot of benefits because it uses JavaScript’s strongest feature, as I’ve said many times: higher-order functions. With functions, ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.