Thanks for the clarification, Brian!
On Monday, April 13, 2020 at 2:56:49 PM UTC+6, Brian Candler wrote:
>
> On Sunday, 12 April 2020 18:12:16 UTC+1, Tanmay Das wrote:
>>
>> this is not my first statically typed language, I know a little bit of C
>> and Java. I was under the impression that Go is capable of some dynamic
>> behavior. Maybe things like Go's type inference, duck typing, empty
>> interface{} led me to believe that. All these type-related bindings can be
>> resolved at compile-time. So I was thinking, if the compiler can do some
>> extra work for resolving the types, maybe it could add a few more steps to
>> keep track of which function to call when an undefined method is accessed.
>
>
> There's no type inference in go, except for defining a variable and
> initializing it from an expression at the same time:
>
> v := foo()
>
> In this case you don't need to declare the type of v, because it's implied
> from the return type of foo.
>
> The nearest to dynamic typing (and indeed duck typing) is interfaces. You
> can define an interface such as:
>
> type Foo interface {
> Bar()
> }
>
> and then declare a variable of that type:
>
> var v Foo
>
> When you later assign something to var v, you can only assign a value of
> some type which includes the Bar() method. This is statically enforced (at
> compile time): you simply can't write a program which assigns a value which
> doesn't have the Bar() method.
> https://play.golang.org/p/hYZNPx0L187
>
> Note that the types you create which include a Bar() method *don't* need
> to declare that they implement the Foo interface; this is implicit by the
> fact that they have the correct methods, which makes it rather like
> duck-typing.
>
> Interfaces with only a single method are very common, since the same
> object can implement many different interfaces if required.
>
> This feature gives a huge amount of flexibility. For example, the
> io.Reader <https://tour.golang.org/methods/21> interface is simple but
> pervasive.
>
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