How to loop in Golang without using the iterator? [duplicate]

Question

I know this works.

for i :=range []int{1, 2, 3....} {
    fmt.Println(i)
}

But If I want to do something like:

for i :=range []int{1, 2, 3....} {
    code = GenNewCode()
    Insert(code)
}

I get an error that i was not used. Is there a way I can do it without getting the above error? (Pardon me if this is a silly question, I am just learning Golang a bit.)

No, that's valid: play.golang.org/p/WFHSrsjISC Please show an example with the error your'e seeing — Mr_Pink
– Mr_Pink, Commented Dec 21, 2016 at 19:17

svenwltr · Accepted Answer · 2016-12-21 19:26:56Z

1

You can ignore such things by using the blank identifier: _

for _ := range []int{1, 2, 3} {
    code = GenNewCode()
    Insert(code)
}

Or one can use (via JimB's comment)

for range []int{1, 2, 3}{
code = GenNewCode()
    Insert(code)
}

edited Dec 21, 2016 at 19:26

answered Dec 21, 2016 at 19:16

svenwltr

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3 Comments

Mr_Pink Over a year ago

You don't need the _, just use for range []int{1, 2, 3}

impossible Over a year ago

Awesome! Learnt one more thing. Thanks!

vnj Over a year ago

Also when using blank identifier, the : will cause an error no new variables on left side of := ; it must be for _ = range []int{1, 2, 3} ; JimB's answer is cleaner though.

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