strings.Replacer：位置相关的错误/功能？

Question

I get the output:

Hello World
Hello 

With the following code:

package main

import(
    "fmt"
    "strings"
)

func main(){
    s := "Hello World"
    fmt.Println(strings.NewReplacer("Hello","").Replace(s))
    fmt.Println(strings.NewReplacer("World","").Replace(s))
}

Is this a bug? Is there a better way to remove substrings?

Answer 1

I'm no go expert, but it looks like a bug to me.

This works:

package main

import(
    "fmt"
    "strings"
)

func main(){
    s := "Hello World"
    fmt.Println(strings.NewReplacer("Hello"," ").Replace(s))
    fmt.Println(strings.NewReplacer("World","").Replace(s))
}

Output:

   World 

Hello

Maybe there is an empty string keyword?

Even this works:

fmt.Println(strings.NewReplacer("ello", "").Replace(s))

This also works:

fmt.Println(strings.NewReplacer("Hello","", "Hi", "").Replace(s))

As orthopteroid mentioned, it seems single-replacement is special cased and buggy.