ut2/lib/orderBy.js

一个现代 JavaScript 实用工具库。[点击查看在线文档]。

'use strict';

var identity = require('./identity.js');
var createIteratee = require('./internals/createIteratee.js');
var compare = require('./internals/compare.js');
var isArray = require('./isArray.js');
var forEach = require('./forEach.js');
var native = require('./internals/native.js');

var orderBy = function (collection, iteratees, orders) {
    var result = [];
    iteratees = (isArray(iteratees) ? iteratees : iteratees !== native.nativeUndefined ? [iteratees] : [identity]);
    orders = (isArray(orders) ? orders : orders !== native.nativeUndefined ? [orders] : []);
    var index = -1;
    forEach(collection, function (item, key, arr) {
        var criteria = iteratees.map(function (iteratee) { return createIteratee(iteratee)(item, key, arr); });
        result.push({
            criteria: criteria,
            index: ++index,
            value: item
        });
    });
    return result.sort(function (a, b) { return compare.compareMultiple(a, b, orders); }).map(function (item) { return item.value; });
};

module.exports = orderBy;