67 lines
1.7 KiB
JavaScript
67 lines
1.7 KiB
JavaScript
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"use strict";
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var objDef = require("obj-def"),
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sliced = require("sliced");
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/**
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* oneByOne
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* Calls functions one by one and memorizes the results.
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*
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* @name oneByOne
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* @function
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* @param {Array} arr An array of functions getting the callback parameter in
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* the first argument and response arguments from the previous function call.
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* @param {Function} cb The callback function called with an error (or `null`)
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* and the results array.
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* @return {oneByOne} The `oneByOne` function.
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*/
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module.exports = function oneByOne(arr, cb) {
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var self = this,
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result = [null],
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lastRes = [];
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// This is called when everything is done
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var done = function done() {
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// result: [null|Error, [data1, data2], ...args]
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cb && cb.apply(self, result.concat(lastRes));
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};
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// This make sure that the functions are executed one by one
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var doSeq = function doSeq(i) {
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// We are done
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if (i === arr.length) {
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return done();
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}
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var cFunc = arr[i];
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if (typeof cFunc !== "function") {
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return doSeq(++i);
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}
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// Call the current function
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cFunc.apply(self, [function () {
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var args = sliced(arguments);
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// Prepare the result data
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for (var ii = 1; ii < args.length; ++ii) {
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var cRes = objDef(result, ii, []);
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cRes[i] = args[ii];
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}
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// We found an error
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if (args[0]) {
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result[0] = args[0];
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return done();
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}
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lastRes = sliced(args, 1);
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doSeq(++i);
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}].concat(lastRes));
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};
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doSeq(0);
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};
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