lo/docs/data/core-uniqbyerr.md

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

name	slug	sourceRef	category	subCategory	signatures	variantHelpers	similarHelpers	position
UniqByErr	uniqbyerr	slice.go#L240	core	slice	func UniqByErr[T any, U comparable, Slice ~[]T](collection Slice, iteratee func(item T) (U, error)) (Slice, error)	core#slice#uniqbyerr	core#slice#uniqby core#slice#uniq core#slice#uniqmap core#slice#partitionby	111

Returns a duplicate-free version of a slice based on a computed key using an iteratee that can return an error. Stops iteration immediately when an error is encountered. Keeps only the first element for each unique key.

// Error case - stops on first error
result, err := lo.UniqByErr([]int{0, 1, 2, 3, 4, 5}, func(i int) (int, error) {
    if i == 3 {
        return 0, fmt.Errorf("number 3 is not allowed")
    }
    return i % 3, nil
})
// []int(nil), error("number 3 is not allowed")

// Success case
result, err := lo.UniqByErr([]int{0, 1, 2, 3, 4, 5}, func(i int) (int, error) {
    return i % 3, nil
})
// []int{0, 1, 2}, nil