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DistinctBy

func DistinctBy[T any, K comparable](slice []T, keySelector func(T) K) []T

DistinctBy returns a slice containing only the first occurrence of each element, where uniqueness is determined by the key returned from the keySelector function.

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package main

import (
    "fmt"

    "github.com/Goldziher/go-utils/sliceutils"
)

func main() {
    type User struct {
        Name string
        Age  int
    }

    users := []User{
        {"Alice", 30},
        {"Bob", 25},
        {"Charlie", 30},
        {"David", 25},
    }

    // Get users with distinct ages (first occurrence only)
    distinctByAge := sliceutils.DistinctBy(users, func(u User) int {
        return u.Age
    })

    fmt.Printf("%v\n", distinctByAge)
    // [{Alice 30} {Bob 25}]
}