maxby.go

package slice

import "github.com/clipperhouse/typewriter"

var maxBy = &typewriter.Template{
	Name: "MaxBy",
	Text: `
// MaxBy returns an element of {{.SliceName}} containing the maximum value, when compared to other elements using a passed func defining ‘less’. In the case of multiple items being equally maximal, the last such element is returned. Returns error if no elements. See: http://clipperhouse.github.io/gen/#MaxBy
func (rcv {{.SliceName}}) MaxBy(less func({{.Type}}, {{.Type}}) bool) (result {{.Type}}, err error) {
	l := len(rcv)
	if l == 0 {
		err = errors.New("cannot determine the MaxBy of an empty slice")
		return
	}
	m := 0
	for i := 1; i < l; i++ {
		if rcv[i] != rcv[m] && !less(rcv[i], rcv[m]) {
			m = i
		}
	}
	result = rcv[m]
	return
}
`}