106 lines
2.3 KiB
JavaScript
106 lines
2.3 KiB
JavaScript
/*!
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* array-sort <https://github.com/jonschlinkert/array-sort>
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*
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* Copyright (c) 2015-2017, Jon Schlinkert.
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* Released under the MIT License.
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*/
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'use strict';
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var defaultCompare = require('default-compare');
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var typeOf = require('kind-of');
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var get = require('get-value');
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/**
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* Sort an array of objects by one or more properties.
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*
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* @param {Array} `arr` The Array to sort.
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* @param {String|Array|Function} `props` One or more object paths or comparison functions.
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* @param {Object} `opts` Pass `{ reverse: true }` to reverse the sort order.
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* @return {Array} Returns a sorted array.
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* @api public
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*/
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function arraySort(arr, props, opts) {
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if (arr == null) {
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return [];
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}
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if (!Array.isArray(arr)) {
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throw new TypeError('array-sort expects an array.');
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}
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if (arguments.length === 1) {
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return arr.sort();
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}
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var args = flatten([].slice.call(arguments, 1));
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// if the last argument appears to be a plain object,
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// it's not a valid `compare` arg, so it must be options.
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if (typeOf(args[args.length - 1]) === 'object') {
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opts = args.pop();
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}
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return arr.sort(sortBy(args, opts));
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}
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/**
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* Iterate over each comparison property or function until `1` or `-1`
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* is returned.
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*
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* @param {String|Array|Function} `props` One or more object paths or comparison functions.
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* @param {Object} `opts` Pass `{ reverse: true }` to reverse the sort order.
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* @return {Array}
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*/
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function sortBy(props, opts) {
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opts = opts || {};
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return function compareFn(a, b) {
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var len = props.length, i = -1;
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var result;
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while (++i < len) {
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result = compare(props[i], a, b);
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if (result !== 0) {
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break;
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}
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}
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if (opts.reverse === true) {
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return result * -1;
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}
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return result;
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};
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}
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/**
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* Compare `a` to `b`. If an object `prop` is passed, then
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* `a[prop]` is compared to `b[prop]`
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*/
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function compare(prop, a, b) {
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if (typeof prop === 'function') {
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// expose `compare` to custom function
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return prop(a, b, compare.bind(null, null));
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}
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// compare object values
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if (prop && typeof a === 'object' && typeof b === 'object') {
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return compare(null, get(a, prop), get(b, prop));
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}
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return defaultCompare(a, b);
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}
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/**
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* Flatten the given array.
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*/
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function flatten(arr) {
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return [].concat.apply([], arr);
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}
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/**
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* Expose `arraySort`
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*/
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module.exports = arraySort;
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