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flow-static-land
Advanced tools
The idea (faking higher kinded types in Flow) is based on the paper Lightweight higher-kinded polymorphism and elm-brands.
import * as maybe from 'flow-static-land/lib/Maybe'
import * as arr from 'flow-static-land/lib/Arr'
const f = (n) => n * 2
const g = (n) => n + 1
// functor
maybe.map(f, maybe.Nothing) // => null
maybe.map(f, maybe.of(3)) // => 6
const a1 = arr.inj([f, g])
const a2 = arr.inj([1, 2, 3])
// applicative
arr.ap(a1, a2) // => [2, 4, 6, 2, 3, 4]
Statically type checked
maybe.map(f, maybe.of('s'))
Error
maybe.map(f, maybe.of('s'))
^^^^^^^^^^^^^ call of method `of`
const f = (n) => n * 2
^ string. This type is incompatible with
const f = (n) => n * 2
^^^^^ number
examples
directory:
npm install flow-static-land --save
Babel config
{
"presets": ["es2015"],
"plugins" : [
"syntax-flow",
"transform-flow-strip-types",
"transform-class-properties"
]
}
The MIT License (MIT)
FAQs
Implementation of common algebraic types in JavaScript + Flow
We found that flow-static-land demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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