An intresting behaviour about number of allocations in []byte->string conversions

[T L]

package main

import "fmt"
import "bytes"
import "testing"

const N = 0
var name = bytes.Repeat([]byte{'x'}, N)
var m = make(map[string]string, 10)
var s string

func f() {
    s = m[string(name)]
}

func g() {
    key := string(name)
    s = m[key]
}

func h() {
    m[string(name)] = "Golang"
}

func main() {
    fmt.Println(testing.AllocsPerRun(1, f)) // 0
    fmt.Println(testing.AllocsPerRun(1, g)) // 1
    fmt.Println(testing.AllocsPerRun(1, h)) // 1
}

/* The result:

N          f    g    H
---        ---    ---    ---
>=9        0    1    1
8,4,2,1,0  0    0    0
6,7        0    1    1
3,5        0    1    0
*/

Some inaccuracies in testing.AllocsPerRun?

[T L]

Sorry, I temporarily switch to Go 1.3.

The result is constantly 0 0 1 for Go 1.15 when N > 2.