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Is there a simple way to achieve this with lodash?

_.something([{a: 3, b: 4}, {a: 3, b: 5}, {a: 10}], 'a')

=> { 3: [ {a: 3, b: 4}, {a: 3, b: 5 } ], 10: [{ a: 10 }]}

That is, group all the values that share the same key together as an array under that key.

Is there a simple way to achieve this with lodash?

_.something([{a: 3, b: 4}, {a: 3, b: 5}, {a: 10}], 'a')

=> { 3: [ {a: 3, b: 4}, {a: 3, b: 5 } ], 10: [{ a: 10 }]}

That is, group all the values that share the same key together as an array under that key.

• javascript
• object
• lodash

Share Improve this question Follow asked Sep 9, 2018 at 11:20 Steve BennettSteve Bennett 127k4545 gold badges186186 silver badges243243 bronze badges

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You could use _.groupBy for grouping by a given key.

Creates an object posed 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).

console.log(_.groupBy([{ a: 3, b: 4 }, { a: 3, b: 5 }, { a: 10 }], 'a'));

.as-console-wrapper { max-height: 100% !important; top: 0; }

<script src="https://cdnjs.cloudflare./ajax/libs/lodash.js/4.15.0/lodash.min.js"></script>

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