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41 lines
1.4 KiB
41 lines
1.4 KiB
var baseAssignValue = require('./_baseAssignValue'), |
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createAggregator = require('./_createAggregator'); |
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/** Used for built-in method references. */ |
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var objectProto = Object.prototype; |
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/** Used to check objects for own properties. */ |
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var hasOwnProperty = objectProto.hasOwnProperty; |
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/** |
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* Creates an object composed of keys generated from the results of running |
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* each element of `collection` thru `iteratee`. The order of grouped values |
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* is determined by the order they occur in `collection`. The corresponding |
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* value of each key is an array of elements responsible for generating the |
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* key. The iteratee is 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} [iteratee=_.identity] The iteratee to transform keys. |
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* @returns {Object} Returns the composed aggregate object. |
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* @example |
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* |
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* _.groupBy([6.1, 4.2, 6.3], Math.floor); |
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* // => { '4': [4.2], '6': [6.1, 6.3] } |
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* |
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* // The `_.property` iteratee shorthand. |
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* _.groupBy(['one', 'two', 'three'], 'length'); |
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* // => { '3': ['one', 'two'], '5': ['three'] } |
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*/ |
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var groupBy = createAggregator(function(result, value, key) { |
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if (hasOwnProperty.call(result, key)) { |
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result[key].push(value); |
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} else { |
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baseAssignValue(result, key, [value]); |
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} |
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}); |
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module.exports = groupBy;
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