Golang undefined: err

Question

I am trying out the simple following conversion program.

package main import ( "fmt" "strconv" ) func main(){ var numStr string="2213" var numVar int64 numVar,err=strconv.ParseInt(numStr,10,64) fmt.Println(numVar) }

The above throws the following compilation error.

undefined: err

Then I tried to define the err, error variable.

package main import ( "fmt" "strconv" ) func main(){ var numStr string="2213" var numVar int64 var err error numVar,err=strconv.ParseInt(numStr,10,64) fmt.Println(numVar) }

But then the compiler throws the following error this time.

err declared and not used

I referred to the following stackoverflow question Undefined err variable but did not get complete understanding of the behavior and hence asking the question here.

See these options op1 and op2: play.golang.org/p/z3PlcAIrd4e — Aristofanio Garcia
– Aristofanio Garcia, Commented Apr 30, 2018 at 4:40

mu is too short · Accepted Answer · 2018-04-30 19:09:04Z

You declare err:

var err error

and then you assign something to it:

numVar,err=strconv.ParseInt(numStr,10,64)

but then you don't look at err or access it. Just assigning something a value doesn't count as using it, you have to look at err:

numVar,err=strconv.ParseInt(numStr,10,64) if err != nil { // Complain or something here }

If you really don't want to bother with the error, then say so by using the blank identifier:

numVar, _ = strconv.ParseInt(numStr, 10, 64)

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