great!
On Mon, Jan 29, 2018 at 9:28 PM, Flying <zjn.fly...@gmail.com> wrote:
> thanks
>
> yes, i think i have understood. as you said, fn is a value not a function
> call, the thing that we defer a function call means it will be called
> later. if we defer a fn not a fn(), the compile doesn't know you want to
> call a function later
>
>
>
> On Monday, January 29, 2018 at 12:29:56 AM UTC+8, Michael Jones wrote:
>>
>> Flying, another way to think of it is that fn is not a function call, it
>> is a function pointer value--a value just like 3.14 or "true." It would not
>> make sense to defer a value, since defer is about "defer the invocation of
>> a function." We make the function value fn become a function invocation by
>> appending the "()" to it. This is the reason. As others have said, this is
>> also good because it gives you a place to pass the parameters that usually
>> are needed "defer close(file)" and because the meaning of this can be
>> subtle (when do you record the value of file so that you can know it when
>> close is eventually called.)
>>
>> On Sun, Jan 28, 2018 at 12:39 AM, Doğan Kurt <kultig...@gmail.com> wrote:
>>
>>> how will you pass parameters if its defer fn?
>>>
>>>
>>> On Sunday, January 28, 2018 at 3:42:03 AM UTC+1, Flying wrote:
>>>>
>>>> example :
>>>> fn := func() {
>>>> fmt.Println(10)
>>>> }
>>>> defer fn()
>>>>
>>>>
>>>> my question is why use defer fn() not defer fn
>>>>
>>>>
>>>> when we use fn() here doesn't it mean call it now ???
>>>>
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>>
>>
>>
>> --
>> Michael T. Jones
>> michae...@gmail.com
>>
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