non-name c[0] on left side of :=

[Sugatang Itlog]

Hi new in Go and am using the ebook (and excercises) from http://www.miek.nl/downloads/Go/Learning-Go-latest.pdf. And am still at chapter 1.

Though am getting the error ... when running go run adrihello.go.

[root@localhost GoTutorial]# go run adrihello.go

# command-line-arguments

./adrihello.go:8: non-name c[0] on left side of :=

[root@localhost GoTutorial]#

And here is the code

[root@localhost GoTutorial]# cat adrihello.go

package main

import "fmt"

func main() {

  s := "hello";

  c := []rune(s);

  c[0] := 'c';

  s2 := string(c);

  fmt.Printf("%s\n", s2);

}

[root@localhost GoTutorial]#

Thanks and really appreciate for the time and assistance.

Regards,

SGTItlog

[Sugatang Itlog]

Here is the version that am using ...

[root@localhost GoTutorial]# go version

go version go1.2.1 linux/amd64

[root@localhost GoTutorial]#

Thanks and Regards,

SGTItlog

[Matt Silverlock]

:= is short-hand for "var name = thing", and both declares and assigns the "thing" to a variable of "name" (the type is inferred). You can't declare a slice index (what c[0] is) or a map key.

See http://play.golang.org/p/8lKqawXeHK - just change := to a simple = assignment operator.

[mikespook]

I think you are using an old version of "Leaning GO". 

Here's the source code form the latest version, page 6:

s := "hello"

c := []rune(s)

c[0] = 'c'

Two differences:

1. No semicolon at the end of lines.

2. It is `c[0] = 'c'` but `c[0] := 'c'`

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[Sugatang Itlog]

Thank you and noted on that. To much typing on my side ^_^.And nice link and will rather use it for the meantime.

Thanks and Regards,

SGTItlog