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build/node_modules/slide/lib/async-map-ordered.js

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