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Core Minindexbyerr

docs/data/core-minindexbyerr.md

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Original Source

Searches the minimum value using a comparison function and returns the value and its index. Returns (zero value, -1, nil) when empty. Stops iteration immediately when an error is encountered.

go
type Point struct{ X int }
value, idx, err := lo.MinIndexByErr([]Point{{1}, {5}, {3}}, func(a, b Point) (bool, error) {
    return a.X < b.X, nil
})
// value == {1}, idx == 0, err == nil
go
// Error case - stops on first error
_, _, err := lo.MinIndexByErr([]Point{{1}, {5}, {0}}, func(a, b Point) (bool, error) {
    if a.X == 0 || b.X == 0 {
        return false, fmt.Errorf("zero value not allowed")
    }
    return a.X < b.X, nil
})
// error("zero value not allowed")
go
// Error case on first comparison
_, _, err := lo.MinIndexByErr([]Point{{1}, {5}}, func(a, b Point) (bool, error) {
    return false, fmt.Errorf("comparison error")
})
// error("comparison error")