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Subset provides basic and generalized set operations for JavaScript. They are inspired by a subset of the interface to Haskell's Data.List, but optimized for JavaScript semantics.
The new ES6 Set
class is not particularly helpful for doing set operations on general objects (as their only version of equality is ===
), and this module provides a general alternative for people who want to do the same-ish things on arrays.
Use it with qualified imports with the yet unfinished module import
syntax or attach it to the short variable of choice. For selling points, here's how it will look with ES7 modules.
import { equality, union, unionBy, intersect, unique, uniqueBy, insert, delete, group } from 'autonomy'
intersect([1,2,3,4], [2,4,6,8]); // [ 2, 4 ]
union([1,3,5], [4,5,6]); // [ 1, 3, 5, 4, 6 ]
unionBy(equality('a'), [{ a: 1 }, { a: 3 }], [{ a: 2 }, { a: 3 }]);
// [ { a: 1 }, { a: 3 }, { a: 2 } ]
unique([1,3,2,4,1,2]); // [ 1, 3, 2, 4 ]
var notCoprime = (x, y) => gcd(x, y) > 1;
var primes = uniqueBy(notCoprime, [2,3,4,5,6,7,8,9,10,11,12]); // [ 2, 3, 5, 7, 11 ]
group([1,2,2,3,5,5,2]); // [ [1], [2,2], [3], [5,5], [2] ]
insert([1,2,3,4], 3); // [ 1, 2, 3, 3, 4 ]
delete([1,2,3,2,3], 2); // [ 1, 3, 2, 3 ]
Read the full API.
Note that it is often useful to get it with the larger utility library interlude for which it was made.
MIT-Licensed. See LICENSE file for details.
FAQs
Generalized set operations and comparisons in the style of Haskell
The npm package subset receives a total of 1,058 weekly downloads. As such, subset popularity was classified as popular.
We found that subset demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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