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Viewing file:     foldl.js (2.61 KB)      -rw-r--r--

'use strict';

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

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

var _eachOfSeries2 = _interopRequireDefault(_eachOfSeries);

var _noop = require('lodash/noop');

var _noop2 = _interopRequireDefault(_noop);

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

var _once2 = _interopRequireDefault(_once);

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

var _wrapAsync2 = _interopRequireDefault(_wrapAsync);

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|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 complete 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).
 * @example
 *
 * async.reduce([1,2,3], 0, function(memo, item, callback) {
 *     // pointless async:
 *     process.nextTick(function() {
 *         callback(null, memo + item)
 *     });
 * }, function(err, result) {
 *     // result is now equal to the last value of memo, which is 6
 * });
 */
function reduce(coll, memo, iteratee, callback) {
    callback = (0, _once2.default)(callback || _noop2.default);
    var _iteratee = (0, _wrapAsync2.default)(iteratee);
    (0, _eachOfSeries2.default)(coll, function (x, i, callback) {
        _iteratee(memo, x, function (err, v) {
            memo = v;
            callback(err);
        });
    }, function (err) {
        callback(err, memo);
    });
}
module.exports = exports['default'];