Operation indexOf

stream.IndexOf

It returns the index of the given element in the stream

Signature

func (s stream.Stream) IndexOf(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"})

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

Download

Benchmark

IndexOf the first element in the stream

Test Identifier	Stream Len	Speed
BenchmarkIndexOfString10FirstElement-4	10	275 ns/op
BenchmarkIndexOfString100FirstElement-4	100	277 ns/op
BenchmarkIndexOfString1000FirstElement-4	1000	280 ns/op
BenchmarkIndexOfString5000FirstElement-4	5000	276 ns/op

IndexOf the last element in the stream

Test Identifier	Stream Len	Speed
BenchmarkIndexOfString10LastElement-4	10	273 ns/op
BenchmarkIndexOfString100LastElement-4	100	327 ns/op
BenchmarkIndexOfString1000LastElement-4	1000	764 ns/op
BenchmarkIndexOfString5000LastElement-4	5000	3687 ns/op

IndexOf a non found element

Test Identifier	Stream Len	Speed
BenchmarkIndexOfString10NotFound-4	10	266 ns/op
BenchmarkIndexOfString100NotFound-4	100	337 ns/op
BenchmarkIndexOfString1000NotFound-4	1000	1248 ns/op
BenchmarkIndexOfString5000NotFound-4	5000	7288 ns/op