std/object/groupBy
Groups the given array of values by the given key selector.
Type signature
(selector: (x: unknown) => string) => (xs: unknown[]) => ResultExamples
groupBy((x) =>
x % 2 == 0 ? "even" : "odd",
)([1, 2, 3, 4, 5, 6, 7]);
// ⇒ { even: [2, 4, 6], odd: [1, 3, 5, 7] }
Questions
- How to group an array by a key function?