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lodash.combinations

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Calculates all possible combinations without repetition of a certain size.

github.com/SeregPie/lodash.combinations

SeregPie/lodash.combinations

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# lodash.combinations `_.combinations(collection, k)` Calculates all possible combinations without repetition of a certain size. | argument | description | | ---: | :--- | | `collection` | A collection of distinct values to calculate the groups from. | | `k` | A number as the size of each group. | Returns the calculated groups as an array of arrays. ## setup ```shell npm i lodash.combinations ``` --- ```javascript import 'lodash.combinations'; import _ from 'lodash'; ``` ### CDN ```html <script src="https://unpkg.com/lodash"></script> <script src="https://unpkg.com/lodash.combinations"></script> ``` ## usage ```javascript let combinations = _.combinations([true, {a: 1}, null], 2); // => [[true, {a: 1}], [true, null], [{a: 1}, null]] ``` --- Calculate all possible combinations of all possible sizes. ```javascript let combinations = _.flatMap([2, 4, 6], (v, i, a) => _.combinations(a, i + 1)); // => [[2], [4], [6], [2, 4], [2, 6], [4, 6], [2, 4, 6]] ``` ## see also - [lodash.permutations](https://github.com/SeregPie/lodash.permutations) - [lodash.multicombinations](https://github.com/SeregPie/lodash.multicombinations) - [lodash.multipermutations](https://github.com/SeregPie/lodash.multipermutations) - [lodash.product](https://github.com/SeregPie/lodash.product)