lo/docs/data/parallel-partitionby.md

name, slug, sourceRef, category, subCategory, playUrl, similarHelpers, position, signatures, variantHelpers

name	slug	sourceRef	category	subCategory	playUrl	similarHelpers	position	signatures	variantHelpers
PartitionBy	partitionby	parallel/slice.go#L92	parallel	slice		core#slice#partitionby parallel#slice#groupby	40	func PartitionBy[T any, K comparable, Slice ~[]T](collection Slice, iteratee func(item T) K) []Slice	parallel#slice#partitionby

Returns a slice of groups where contiguous elements sharing the same key are batched together. Groups are created from the results of running each element of the collection through the predicate. The predicate is called in parallel and the order of groups follows their first appearance in the collection.

import (
    lop "github.com/samber/lo/parallel"
)

groups := lop.PartitionBy([]int{-2, -1, 0, 1, 2, 3, 4, 5}, func(x int) string {
    if x < 0 { return "negative" }
    if x%2 == 0 { return "even" }
    return "odd"
})
// [][]int{{-2, -1}, {0, 2, 4}, {1, 3, 5}}

Works with any comparable key type:

type Bucket int
parts := lop.PartitionBy([]int{1,2,2,3,3,3}, func(x int) Bucket {
    return Bucket(x)
})
// [][]int{{1}, {2,2}, {3,3,3}}