lo/docs/data/core-repeatbyerr.md

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

name	slug	sourceRef	category	subCategory	signatures	variantHelpers	similarHelpers	position
RepeatByErr	repeatbyerr	slice.go#L564	core	slice	func RepeatByErr[T any](count int, callback func(index int) (T, error)) ([]T, error)	core#slice#repeatbyerr	core#slice#repeatby core#slice#times core#slice#repeat	225

Builds a slice by calling the callback N times with the current index. The callback can return an error to stop iteration immediately.

result, err := lo.RepeatByErr(5, func(i int) (int, error) {
    return i * i, nil
})
// []int{0, 1, 4, 9, 16}, <nil>

Example with error:

result, err := lo.RepeatByErr(5, func(i int) (int, error) {
    if i == 3 {
        return 0, fmt.Errorf("number 3 is not allowed")
    }
    return i * i, nil
})
// []int(nil), error("number 3 is not allowed")