_.groupBy(collection, [iteratee=_.identity])
Creates an object composed of keys generated from the results of running each element of collection
thru iteratee
. The order of grouped values is determined by the order they occur in collection
. The corresponding value of each key is an array of elements responsible for generating the key. The iteratee is invoked with one argument: (value).
Since
0.1.0
Arguments
-
collection
(Array|Object): The collection to iterate over. -
[iteratee=_.identity]
(Function): The iteratee to transform keys.
Returns
(Object): Returns the composed aggregate object.
Example
_.groupBy([6.1, 4.2, 6.3], Math.floor); // => { '4': [4.2], '6': [6.1, 6.3] } // The `_.property` iteratee shorthand. _.groupBy(['one', 'two', 'three'], 'length'); // => { '3': ['one', 'two'], '5': ['three'] }
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