firstitem

README

First item in a loop

When you build a result using a for loop, the first item might need a specific treatment.

The most efficient solution is to use an if statement to avoid code duplication. Whatever the test, no significant difference appears.

The unfair solution doesn't take the full hypothesis into account and gets a 10% improvement.

src>go test -bench=. ./firstitem

Results

go version go1.12 windows/amd64

BenchmarkFirstItemBefore-4                 20000             86551 ns/op
BenchmarkFirstItemIfOnIndex-4              20000             88000 ns/op
BenchmarkFirstItemIfOnArray-4              20000             88107 ns/op
BenchmarkFirstItemBeforeUnfair-4           20000             70460 ns/op
PASS

Documentation

Index

• func FirstItemBefore(a int) (l int)
• func FirstItemBeforeUnfair(a int) (l int)
• func FirstItemIfOnArray(a int) (l int)
• func FirstItemIfOnIndex(a int) (l int)

Functions

func FirstItemBefore

func FirstItemBefore(a int) (l int)

func FirstItemBeforeUnfair

func FirstItemBeforeUnfair(a int) (l int)

func FirstItemIfOnArray

func FirstItemIfOnArray(a int) (l int)

func FirstItemIfOnIndex

func FirstItemIfOnIndex(a int) (l int)