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rpominov/Type.js

Last active May 15, 2016 18:56
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An idea of Algebraic data types helper in JS
Raw
Type.js
const Maybe = Type({Just: ['value'], Nothing: []}, {
map(fn, maybe) {
return Maybe.case({
Just: ({value}) => Maybe.Just(fn(value)),
// Should x => x be the default handler in case() so we could omit Nothing here?
Nothing: m => m,
})
}
})
const just1 = Maybe.Just(1) // {T: 'Just', value: 1}
const nothing = Maybe.Nothing() // {T: 'Nothing'}
Maybe.map(x => x + 1, just1) // {T: 'Just', value: 2}
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Compatible with https://github.com/rpominov/static-land

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