想要串入int吗？ [重复]

Question

This question already has an answer here:

• How to convert an int value to string in Go? 9 answers

I really thought this would be as simple as :

string(myInt)

It appears not.

I am writing a function which takes a slice of ints, and appends each one to a string - and adds a separator between each one. Here is my code.

func(xis *Int16Slice) ConvertToStringWithSeparator(separator string) string{
    var buffer bytes.Buffer
    for i, value := range *xis{
        buffer.WriteString(string(value))
        if i != len(*xis) -1 {
            buffer.WriteString(separator)
        }
    }
    return buffer.String()
}

Please read the sentence below. This is not a duplicate of How to convert an int value to string in Go? - because : I am aware of things like the strconv.Itoa function, but it appears as though that will only work on "regular" ints. It will not support an int16

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Answer 1

You can use strconv.Itoa (or strconv.FormatInt if performance is critical) by simply converting the int16 to an int or int64, for example (Go Playground):

x := uint16(123)
strconv.Itoa(int(x))            // => "123"
strconv.FormatInt(int64(x), 10) // => "123"

Note that strconv.FormatInt(...) may be slightly faster according to a simple benchmark:

// itoa_test.go
package main

import (
  "strconv"
  "testing"
)

const x = int16(123)

func Benchmark_Itoa(b *testing.B) {
  for i := 0; i < b.N; i++ {
    strconv.Itoa(int(x))
  }
}

func Benchmark_FormatInt(b *testing.B) {
  for i := 0; i < b.N; i++ {
    strconv.FormatInt(int64(x), 10)
  }
}

Run as $ go test -bench=. ./itoa_test.go:

goos: darwin
goarch: amd64
Benchmark_Itoa-8            50000000            30.3 ns/op
Benchmark_FormatInt-8       50000000            27.8 ns/op
PASS
ok      command-line-arguments  2.976s