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52 lines
1.8 KiB
52 lines
1.8 KiB
var baseFlatten = require('./_baseFlatten'),
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baseOrderBy = require('./_baseOrderBy'),
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isIterateeCall = require('./_isIterateeCall'),
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rest = require('./rest');
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/**
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* Creates an array of elements, sorted in ascending order by the results of
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* running each element in a collection through each iteratee. This method
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* performs a stable sort, that is, it preserves the original sort order of
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* equal elements. The iteratees are invoked with one argument: (value).
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*
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* @static
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* @memberOf _
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* @category Collection
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* @param {Array|Object} collection The collection to iterate over.
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* @param {...(Function|Function[]|Object|Object[]|string|string[])} [iteratees=[_.identity]]
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* The iteratees to sort by, specified individually or in arrays.
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* @returns {Array} Returns the new sorted array.
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* @example
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*
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* var users = [
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* { 'user': 'fred', 'age': 48 },
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* { 'user': 'barney', 'age': 36 },
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* { 'user': 'fred', 'age': 42 },
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* { 'user': 'barney', 'age': 34 }
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* ];
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*
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* _.sortBy(users, function(o) { return o.user; });
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* // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 42]]
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*
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* _.sortBy(users, ['user', 'age']);
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* // => objects for [['barney', 34], ['barney', 36], ['fred', 42], ['fred', 48]]
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*
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* _.sortBy(users, 'user', function(o) {
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* return Math.floor(o.age / 10);
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* });
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* // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 42]]
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*/
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var sortBy = rest(function(collection, iteratees) {
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if (collection == null) {
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return [];
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}
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var length = iteratees.length;
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if (length > 1 && isIterateeCall(collection, iteratees[0], iteratees[1])) {
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iteratees = [];
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} else if (length > 2 && isIterateeCall(iteratees[0], iteratees[1], iteratees[2])) {
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iteratees.length = 1;
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}
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return baseOrderBy(collection, baseFlatten(iteratees), []);
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});
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module.exports = sortBy;
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