Operation lastIndexOf

stream.LastIndexOf

It returns the last index of the given element in the stream

Signature

func (s stream.Stream) LastIndexOf(element interface{}) (index int,err error)

Arguments

Name	Type	Description
element	interface{}	Element to be found in the stream

Output

Name	Type	Description
out	*stream.Output	It's a pointer to the below structure

type Output struct {
  value reflect.Value
  error *errors.Error
}

Errors

Type	Description
err.items-nil	The stream is nil
err.invalid-argument	A nil value can not be dropped from a Stream of non-pointers values
err.invalid-argument	Element type must be the same than the elements in the stream

Example

package main

import (
	"fmt"
	"github.com/wesovilabs/koazee"
)

var stream = koazee.StreamOf([]string{"Dog","Cat","Monkey","Rabbit","Turtle","Monkey"})

func main() {
	index,_:=stream.LastIndexOf("Monkey")
	fmt.Println(index)
}

Download

Benchmark

LastIndexOf the first element in the stream

Test Identifier	Stream Len	Speed
BenchmarkLastIndexOfString10FirstElement-4	10	274 ns/op
BenchmarkLastIndexOfString100FirstElement-4	100	325 ns/op
BenchmarkLastIndexOfString1000FirstElement-4	1000	582 ns/op
BenchmarkLastIndexOfString5000FirstElement-4	5000	3832 ns/op

LastIndexOf the last element in the stream

Test Identifier	Stream Len	Speed
BenchmarkLastIndexOfString10LastElement-4	10	275 ns/op
BenchmarkLastIndexOfString100LastElement-4	100	279 ns/op
BenchmarkLastIndexOfString1000LastElement-4	1000	280 ns/op
BenchmarkLastIndexOfString5000LastElement-4	5000	279 ns/op

LastIndexOf a non found element

Test Identifier	Stream Len	Speed
BenchmarkLastIndexOfString10NotFound-4	10	243 ns/op
BenchmarkLastIndexOfString100NotFound-4	100	361 ns/op
BenchmarkLastIndexOfString1000NotFound-4	1000	1433 ns/op
BenchmarkLastIndexOfString5000NotFound-4	5000	7267 ns/op