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Name	Size	Permission
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internal	[ DIR ]	dr-xr-xr-x
CHANGELOG.md	32.7 KB	-rw-rw-rw-
LICENSE	1.04 KB	-rw-rw-rw-
README.md	3.14 KB	-rw-rw-rw-
all.js	3.48 KB	-rw-rw-rw-
allLimit.js	1.71 KB	-rw-rw-rw-
allSeries.js	1.61 KB	-rw-rw-rw-
any.js	3.71 KB	-rw-rw-rw-
anyLimit.js	1.74 KB	-rw-rw-rw-
anySeries.js	1.64 KB	-rw-rw-rw-
apply.js	217 B	-rw-rw-rw-
applyEach.js	1.94 KB	-rw-rw-rw-
applyEachSeries.js	1.27 KB	-rw-rw-rw-
asyncify.js	3.67 KB	-rw-rw-rw-
auto.js	11.58 KB	-rw-rw-rw-
autoInject.js	6.93 KB	-rw-rw-rw-
bower.json	239 B	-rw-rw-rw-
cargo.js	2.68 KB	-rw-rw-rw-
cargoQueue.js	3.27 KB	-rw-rw-rw-
compose.js	1.53 KB	-rw-rw-rw-
concat.js	3.57 KB	-rw-rw-rw-
concatLimit.js	2.04 KB	-rw-rw-rw-
concatSeries.js	1.44 KB	-rw-rw-rw-
constant.js	302 B	-rw-rw-rw-
detect.js	3.17 KB	-rw-rw-rw-
detectLimit.js	1.79 KB	-rw-rw-rw-
detectSeries.js	1.7 KB	-rw-rw-rw-
dir.js	1.27 KB	-rw-rw-rw-
doDuring.js	2.25 KB	-rw-rw-rw-
doUntil.js	1.66 KB	-rw-rw-rw-
doWhilst.js	2.25 KB	-rw-rw-rw-
during.js	2.28 KB	-rw-rw-rw-
each.js	3.93 KB	-rw-rw-rw-
eachLimit.js	1.75 KB	-rw-rw-rw-
eachOf.js	5.61 KB	-rw-rw-rw-
eachOfLimit.js	1.6 KB	-rw-rw-rw-
eachOfSeries.js	1.3 KB	-rw-rw-rw-
eachSeries.js	1.54 KB	-rw-rw-rw-
ensureAsync.js	2.26 KB	-rw-rw-rw-
every.js	3.48 KB	-rw-rw-rw-
everyLimit.js	1.71 KB	-rw-rw-rw-
everySeries.js	1.61 KB	-rw-rw-rw-
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find.js	3.17 KB	-rw-rw-rw-
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findSeries.js	1.7 KB	-rw-rw-rw-
flatMap.js	3.57 KB	-rw-rw-rw-
flatMapLimit.js	2.04 KB	-rw-rw-rw-
flatMapSeries.js	1.44 KB	-rw-rw-rw-
foldl.js	4.76 KB	-rw-rw-rw-
foldr.js	1.47 KB	-rw-rw-rw-
forEach.js	3.93 KB	-rw-rw-rw-
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forEachOf.js	5.61 KB	-rw-rw-rw-
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forEachOfSeries.js	1.3 KB	-rw-rw-rw-
forEachSeries.js	1.54 KB	-rw-rw-rw-
forever.js	2.07 KB	-rw-rw-rw-
groupBy.js	3.51 KB	-rw-rw-rw-
groupByLimit.js	2.39 KB	-rw-rw-rw-
groupBySeries.js	1.3 KB	-rw-rw-rw-
index.js	19.47 KB	-rw-rw-rw-
inject.js	4.76 KB	-rw-rw-rw-
log.js	1.17 KB	-rw-rw-rw-
map.js	4.49 KB	-rw-rw-rw-
mapLimit.js	1.58 KB	-rw-rw-rw-
mapSeries.js	1.48 KB	-rw-rw-rw-
mapValues.js	4.48 KB	-rw-rw-rw-
mapValuesLimit.js	2.07 KB	-rw-rw-rw-
mapValuesSeries.js	1.35 KB	-rw-rw-rw-
memoize.js	3 KB	-rw-rw-rw-
nextTick.js	1.44 KB	-rw-rw-rw-
package.json	2.15 KB	-rw-rw-rw-
parallel.js	5.44 KB	-rw-rw-rw-
parallelLimit.js	1.48 KB	-rw-rw-rw-
priorityQueue.js	1.41 KB	-rw-rw-rw-
queue.js	626 B	-rw-rw-rw-
race.js	2.08 KB	-rw-rw-rw-
reduce.js	4.76 KB	-rw-rw-rw-
reduceRight.js	1.47 KB	-rw-rw-rw-
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sortBy.js	6.06 KB	-rw-rw-rw-
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unmemoize.js	665 B	-rw-rw-rw-
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waterfall.js	3.13 KB	-rw-rw-rw-
whilst.js	2.28 KB	-rw-rw-rw-
wrapSync.js	3.67 KB	-rw-rw-rw-

Code Editor : reduce.js

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});

var _eachOfSeries = require('./eachOfSeries.js');

var _eachOfSeries2 = _interopRequireDefault(_eachOfSeries);

var _once = require('./internal/once.js');

var _once2 = _interopRequireDefault(_once);

var _wrapAsync = require('./internal/wrapAsync.js');

var _wrapAsync2 = _interopRequireDefault(_wrapAsync);

var _awaitify = require('./internal/awaitify.js');

var _awaitify2 = _interopRequireDefault(_awaitify);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * Reduces `coll` into a single value using an async `iteratee` to return each
 * successive step. `memo` is the initial state of the reduction. This function
 * only operates in series.
 *
 * For performance reasons, it may make sense to split a call to this function
 * into a parallel map, and then use the normal `Array.prototype.reduce` on the
 * results. This function is for situations where each step in the reduction
 * needs to be async; if you can get the data before reducing it, then it's
 * probably a good idea to do so.
 *
 * @name reduce
 * @static
 * @memberOf module:Collections
 * @method
 * @alias inject
 * @alias foldl
 * @category Collection
 * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
 * @param {*} memo - The initial state of the reduction.
 * @param {AsyncFunction} iteratee - A function applied to each item in the
 * array to produce the next step in the reduction.
 * The `iteratee` should complete with the next state of the reduction.
 * If the iteratee completes with an error, the reduction is stopped and the
 * main `callback` is immediately called with the error.
 * Invoked with (memo, item, callback).
 * @param {Function} [callback] - A callback which is called after all the
 * `iteratee` functions have finished. Result is the reduced value. Invoked with
 * (err, result).
 * @returns {Promise} a promise, if no callback is passed
 * @example
 *
 * // file1.txt is a file that is 1000 bytes in size
 * // file2.txt is a file that is 2000 bytes in size
 * // file3.txt is a file that is 3000 bytes in size
 * // file4.txt does not exist
 *
 * const fileList = ['file1.txt','file2.txt','file3.txt'];
 * const withMissingFileList = ['file1.txt','file2.txt','file3.txt', 'file4.txt'];
 *
 * // asynchronous function that computes the file size in bytes
 * // file size is added to the memoized value, then returned
 * function getFileSizeInBytes(memo, file, callback) {
 *     fs.stat(file, function(err, stat) {
 *         if (err) {
 *             return callback(err);
 *         }
 *         callback(null, memo + stat.size);
 *     });
 * }
 *
 * // Using callbacks
 * async.reduce(fileList, 0, getFileSizeInBytes, function(err, result) {
 *     if (err) {
 *         console.log(err);
 *     } else {
 *         console.log(result);
 *         // 6000
 *         // which is the sum of the file sizes of the three files
 *     }
 * });
 *
 * // Error Handling
 * async.reduce(withMissingFileList, 0, getFileSizeInBytes, function(err, result) {
 *     if (err) {
 *         console.log(err);
 *         // [ Error: ENOENT: no such file or directory ]
 *     } else {
 *         console.log(result);
 *     }
 * });
 *
 * // Using Promises
 * async.reduce(fileList, 0, getFileSizeInBytes)
 * .then( result => {
 *     console.log(result);
 *     // 6000
 *     // which is the sum of the file sizes of the three files
 * }).catch( err => {
 *     console.log(err);
 * });
 *
 * // Error Handling
 * async.reduce(withMissingFileList, 0, getFileSizeInBytes)
 * .then( result => {
 *     console.log(result);
 * }).catch( err => {
 *     console.log(err);
 *     // [ Error: ENOENT: no such file or directory ]
 * });
 *
 * // Using async/await
 * async () => {
 *     try {
 *         let result = await async.reduce(fileList, 0, getFileSizeInBytes);
 *         console.log(result);
 *         // 6000
 *         // which is the sum of the file sizes of the three files
 *     }
 *     catch (err) {
 *         console.log(err);
 *     }
 * }
 *
 * // Error Handling
 * async () => {
 *     try {
 *         let result = await async.reduce(withMissingFileList, 0, getFileSizeInBytes);
 *         console.log(result);
 *     }
 *     catch (err) {
 *         console.log(err);
 *         // [ Error: ENOENT: no such file or directory ]
 *     }
 * }
 *
 */
function reduce(coll, memo, iteratee, callback) {
    callback = (0, _once2.default)(callback);
    var _iteratee = (0, _wrapAsync2.default)(iteratee);
    return (0, _eachOfSeries2.default)(coll, (x, i, iterCb) => {
        _iteratee(memo, x, (err, v) => {
            memo = v;
            iterCb(err);
        });
    }, err => callback(err, memo));
}
exports.default = (0, _awaitify2.default)(reduce, 4);
module.exports = exports.default;

${this.title}

Code Editor : reduce.js