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https://github.com/samber/lo.git
synced 2026-04-22 15:37:14 +08:00
Samuel Berthe
fa095e4b4f
* fix(doc): fix go playground demo URL * fix(doc): add more go playground demo URL
40 lines
1.0 KiB
Markdown
40 lines
1.0 KiB
Markdown
---
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name: FindDuplicatesByErr
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slug: findduplicatesbyerr
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sourceRef: find.go#L296
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category: core
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subCategory: find
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playUrl: https://go.dev/play/p/HiVILQqdFP0
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signatures:
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- "func FindDuplicatesByErr[T any, U comparable, Slice ~[]T](collection Slice, iteratee func(item T) (U, error)) (Slice, error)"
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variantHelpers:
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- core#find#findduplicatesbyerr
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similarHelpers:
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- core#find#findduplicatesby
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- core#find#findduplicates
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- core#find#finduniques
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- core#find#finduniquesby
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position: 135
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---
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Returns a slice with the first occurrence of each duplicated element by key, preserving order. The iteratee can return an error to stop iteration immediately.
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```go
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result, err := lo.FindDuplicatesByErr([]int{3, 4, 5, 6, 7}, func(i int) (int, error) {
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return i % 3, nil
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})
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// []int{3, 4}, <nil>
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```
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Example with error:
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```go
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result, err := lo.FindDuplicatesByErr([]int{3, 4, 5, 6, 7}, func(i int) (int, error) {
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if i == 5 {
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return 0, fmt.Errorf("number 5 is not allowed")
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}
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return i % 3, nil
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})
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// []int(nil), error("number 5 is not allowed")
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```
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