mirror of
https://github.com/samber/lo.git
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Samuel Berthe
50 lines
1.4 KiB
Markdown
50 lines
1.4 KiB
Markdown
---
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name: MaxIndexBy
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slug: maxindexby
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sourceRef: it/find.go#L326
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category: it
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subCategory: find
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signatures:
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- "func MaxIndexBy[T any](collection iter.Seq[T], comparison func(a, b T) bool) (T, int)"
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playUrl: "https://go.dev/play/p/2JdWA6-zi"
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variantHelpers:
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- it#find#maxindexby
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similarHelpers:
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- core#slice#maxindexby
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position: 490
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---
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Searches the maximum value of a collection using a comparison function and returns both the value and its index.
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If several values are equal to the greatest value, returns the first such value.
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Returns (zero value, -1) when the collection is empty.
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Will iterate through the entire sequence.
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Examples:
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```go
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// Find the maximum string by length and its index
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words := it.Slice([]string{"apple", "hi", "banana", "xylophone"})
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value, index := it.MaxIndexBy(words, func(a, b string) bool {
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return len(a) > len(b)
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})
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// value: "xylophone", index: 3
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// Find the maximum person by age and its index
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people := it.Slice([]Person{
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{Name: "Alice", Age: 30},
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{Name: "Bob", Age: 25},
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{Name: "Charlie", Age: 35},
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})
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value, index := it.MaxIndexBy(people, func(a, b Person) bool {
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return a.Age > b.Age
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})
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// value: {Name: "Charlie", Age: 35}, index: 2
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// Find the maximum number by absolute value and its index
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numbers := it.Slice([]int{-5, 2, -8, 1})
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value, index := it.MaxIndexBy(numbers, func(a, b int) bool {
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return abs(a) > abs(b)
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})
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// value: -8, index: 2
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``` |