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function setArity (arity, fn) { | |
if (typeof setArity.cache === 'undefined') { | |
setArity.cache = {} | |
} | |
if (typeof setArity.cache[arity] === 'undefined') { | |
setArity.cache[arity] = (fn) => { | |
switch (arity) { | |
case 0: return function () { return fn.apply(this, arguments) } | |
case 1: return function (a) { return fn.apply(this, arguments) } | |
case 2: return function (a, b) { return fn.apply(this, arguments) } |
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// this file is just so I can reference the idea behind placeholders - if you want a maintained version, check out: | |
// - https://github.com/thisables/curry | |
// - http://ramdajs.com | |
const __ = Symbol | |
const ARITIES = {} | |
const setArity = (arity, fn) => { | |
if (!ARITIES[arity]) { |
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const users = { | |
1: { name: 'bob' }, | |
2: { name: 'sally' } | |
} | |
const posts = [ | |
{ author: 'sally', title: 'Hello World' }, | |
{ author: 'bob', title: 'How to do stuff' } | |
] |
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function sequentialCallback (...fns) { | |
return (...args) => { | |
const done = args.pop() | |
const next = (error, ...args) => { | |
if (error) return done(error) | |
if (fns.length) { | |
const fn = fns.shift() | |
return fn(...args, next) | |
} | |
return done(null, ...args) |
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const validateTransformation = sequentialCallback( | |
transformSomething, | |
validateTransformed, | |
(validated, callback) => callback(null, validated, 'data is valid:') | |
) | |
validateTransformation({ foo: 'bar' }, (error, validated, label) => { | |
if (error) { | |
console.error(new Error(error)) | |
} else { |
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const validateTransformation = sequentialCallback( | |
transformSomething, | |
validateSomething | |
) | |
const something = { foo: 'bar' } | |
validateTransformation(something, (error, validated) => { | |
if (error) { | |
console.error(new Error(error)) |
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const getValidatedTransformation = sequentialCallback( | |
findSomething, | |
transformSomething, | |
validateTransformed | |
) | |
getValidatedTransformation((error, validated) => { | |
if (error) { | |
console.error(new Error(error)) | |
} else { |
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findSomething() | |
.then(transformSomething) | |
.then(validateTransformed) | |
.then((validated) => console.log('data is valid:', validated)) | |
.catch((error) => console.error(new Error(error)) |
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findSomething() | |
.then((something) => transformSomething(something)) | |
.then((transformed) => validateTransformed(transformed)) | |
.then((validated) => console.log('data is valid:', validated) | |
.catch((error) => console.error(new Error(error)) |
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findSomething((error, something) => { | |
if (error) { | |
throw new Error(error) | |
} | |
transformSomething(something, (error, transformed) => { | |
if (error) { | |
throw new Error(error) | |
} | |
validateTransformed(transformed, (error, validated) => { | |
if (error) { |
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