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48 lines
1.6 KiB
48 lines
1.6 KiB
var baseFlatten = require('./_baseFlatten'), |
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baseOrderBy = require('./_baseOrderBy'), |
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baseRest = require('./_baseRest'), |
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isIterateeCall = require('./_isIterateeCall'); |
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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 thru 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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* @since 0.1.0 |
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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[])} [iteratees=[_.identity]] |
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* The iteratees to sort by. |
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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': 30 }, |
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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', 30]] |
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* |
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* _.sortBy(users, ['user', 'age']); |
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* // => objects for [['barney', 34], ['barney', 36], ['fred', 30], ['fred', 48]] |
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*/ |
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var sortBy = baseRest(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 = [iteratees[0]]; |
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} |
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return baseOrderBy(collection, baseFlatten(iteratees, 1), []); |
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}); |
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module.exports = sortBy;
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