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66 lines
1.7 KiB
JavaScript
66 lines
1.7 KiB
JavaScript
5 years ago
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throw new Error("TODO: Not yet implemented.")
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/*
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usage:
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Like asyncMap, but only can take a single cb, and guarantees
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the order of the results.
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*/
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module.exports = asyncMapOrdered
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function asyncMapOrdered (list, fn, cb_) {
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if (typeof cb_ !== "function") throw new Error(
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"No callback provided to asyncMapOrdered")
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if (typeof fn !== "function") throw new Error(
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"No map function provided to asyncMapOrdered")
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if (list === undefined || list === null) return cb_(null, [])
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if (!Array.isArray(list)) list = [list]
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if (!list.length) return cb_(null, [])
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var errState = null
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, l = list.length
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, a = l
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, res = []
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, resCount = 0
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, maxArgLen = 0
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function cb (index) { return function () {
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if (errState) return
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var er = arguments[0]
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var argLen = arguments.length
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maxArgLen = Math.max(maxArgLen, argLen)
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res[index] = argLen === 1 ? [er] : Array.apply(null, arguments)
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// see if any new things have been added.
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if (list.length > l) {
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var newList = list.slice(l)
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a += (list.length - l)
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var oldLen = l
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l = list.length
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process.nextTick(function () {
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newList.forEach(function (ar, i) { fn(ar, cb(i + oldLen)) })
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})
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}
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if (er || --a === 0) {
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errState = er
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cb_.apply(null, [errState].concat(flip(res, resCount, maxArgLen)))
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}
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}}
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// expect the supplied cb function to be called
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// "n" times for each thing in the array.
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list.forEach(function (ar) {
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steps.forEach(function (fn, i) { fn(ar, cb(i)) })
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})
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}
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function flip (res, resCount, argLen) {
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var flat = []
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// res = [[er, x, y], [er, x1, y1], [er, x2, y2, z2]]
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// return [[x, x1, x2], [y, y1, y2], [undefined, undefined, z2]]
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