From 7fff4499fd915bcea3fa93b1aa8b35f4fe7a6027 Mon Sep 17 00:00:00 2001 From: Florian Dold Date: Sun, 28 May 2017 00:38:50 +0200 Subject: add linting (and some initial fixes) --- node_modules/slide/lib/async-map.js | 54 +++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 node_modules/slide/lib/async-map.js (limited to 'node_modules/slide/lib/async-map.js') diff --git a/node_modules/slide/lib/async-map.js b/node_modules/slide/lib/async-map.js new file mode 100644 index 000000000..ccf345f3c --- /dev/null +++ b/node_modules/slide/lib/async-map.js @@ -0,0 +1,54 @@ + +/* +usage: + +// do something to a list of things +asyncMap(myListOfStuff, function (thing, cb) { doSomething(thing.foo, cb) }, cb) +// do more than one thing to each item +asyncMap(list, fooFn, barFn, cb) + +*/ + +module.exports = asyncMap + +function asyncMap () { + var steps = Array.prototype.slice.call(arguments) + , list = steps.shift() || [] + , cb_ = steps.pop() + if (typeof cb_ !== "function") throw new Error( + "No callback provided to asyncMap") + if (!list) return cb_(null, []) + if (!Array.isArray(list)) list = [list] + var n = steps.length + , data = [] // 2d array + , errState = null + , l = list.length + , a = l * n + if (!a) return cb_(null, []) + function cb (er) { + if (er && !errState) errState = er + + var argLen = arguments.length + for (var i = 1; i < argLen; i ++) if (arguments[i] !== undefined) { + data[i - 1] = (data[i - 1] || []).concat(arguments[i]) + } + // see if any new things have been added. + if (list.length > l) { + var newList = list.slice(l) + a += (list.length - l) * n + l = list.length + process.nextTick(function () { + newList.forEach(function (ar) { + steps.forEach(function (fn) { fn(ar, cb) }) + }) + }) + } + + if (--a === 0) cb_.apply(null, [errState].concat(data)) + } + // expect the supplied cb function to be called + // "n" times for each thing in the array. + list.forEach(function (ar) { + steps.forEach(function (fn) { fn(ar, cb) }) + }) +} -- cgit v1.2.3