Created
August 11, 2019 12:23
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js fn utils compose/pipe curry/uncarry
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const compose = (...fns) => x => fns.reduceRight((g, f) => f(g), x) | |
const pipe = (...fns) => compose.apply(null, fns.reverse()) | |
const composeAsync = (...fns) => x => fns.reduceRight((f, g) => f.then(g), Promise.resolve(x)) | |
const pipeAsync = (...fns) => x => composeAsync.apply(null, fns.reverse()) | |
const curry = (f, ...a) => | |
a.length === f.length | |
? f(...a) | |
: curry.bind(null, f, ...a) | |
const uncurry = f => (...a) => { | |
const r = a.reduce((f, g) => f(g), f) | |
return r instanceof Function | |
? uncurry(r) | |
: r | |
} | |
const sum = (a, b, c, d) => a + b + c + d | |
const sum2 = a => b => c => d => a + b + c + d | |
const txc = compose(curry, uncurry) | |
const c = txc(sum2) | |
const y1 = c(1, 2, 3, 4) | |
const y2 = c(1, 2, 3)(4) | |
const y3 = c(1, 2)(3)(4) | |
const y4 = c(1)(2)(3)(4) | |
const y5 = c(1)(2, 3, 4) | |
const y6 = c(1)(2)(3, 4) | |
const y7 = c(1, 2)(3, 4) | |
const y8 = c(1, 2)(3, 4) | |
console.log({y1, y2, y3, y4, y5, y6, y7, y8}) | |
const txp = pipe(curry, uncurry) | |
const p = txp(sum) | |
const z1 = p(1, 2, 3, 4) | |
const z2 = p(1, 2, 3)(4) | |
const z3 = p(1, 2)(3)(4) | |
const z4 = p(1)(2)(3)(4) | |
const z5 = p(1)(2, 3, 4) | |
const z6 = p(1)(2)(3, 4) | |
const z7 = p(1, 2)(3, 4) | |
const z8 = p(1, 2)(3, 4) | |
console.log({z1, z2, z3, z4, z5, z6, z7, z8}) |
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