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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
32 lines
570 B
Markdown
32 lines
570 B
Markdown
---
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name: CountBy
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slug: countby
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sourceRef: slice.go#L849
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category: core
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subCategory: slice
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playUrl: https://go.dev/play/p/5GMQP5vNT4q
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variantHelpers:
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- core#slice#countby
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similarHelpers:
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- core#slice#count
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- core#slice#every
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- core#slice#some
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- core#slice#filter
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- core#slice#find
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- core#slice#countbyerr
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position: 0
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signatures:
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- "func CountBy[T any](collection []T, predicate func(item T) bool) int"
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---
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Counts the number of elements for which the predicate is true.
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```go
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lo.CountBy([]int{1, 5, 1}, func(i int) bool {
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return i < 4
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})
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// 2
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```
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