lo/docs/data/core-findduplicatesby.md

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

name	slug	sourceRef	category	subCategory	playUrl	variantHelpers	similarHelpers	position	signatures
FindDuplicatesBy	findduplicatesby	find.go#L234	core	find		core#find#findduplicatesby	core#find#findduplicates core#find#finduniques core#find#finduniquesby	130	func FindDuplicatesBy[T any, U comparable, Slice ~[]T](collection Slice, iteratee func(item T) U) Slice

Returns a slice with the first occurrence of each duplicated element by key, preserving order.

lo.FindDuplicatesBy([]int{3, 4, 5, 6, 7}, func(i int) int {
    return i % 3
})
// []int{3, 4}