New Way (Recommended): Please take a look at this answer. Old Way: Supposing you’re writing a program called myprog : Put all your files in a directory like this myproject/go/src/myprog/xxx.go Then add myproject/go to GOPATH And run go install myprog This way you’ll be able to add other packages and programs in myproject/go/src if you … Read more
Well, I figured out the problem. Basically Go starting path for import is $HOME/go/src So I just needed to add myapp in front of the package names, that is, the import should be: import ( “log” “net/http” “myapp/common” “myapp/routers” )
The concept you’re looking for here is variance in the type system. Some type systems and types support covariance and contravariance, but Go’s interfaces do not. While an int can be passed to a function that expects interface{}, the same cannot be said about func(int) and func(interface{}), because interfaces do not behave covariantly. If type … Read more
There are a few common idiomatic ways for a package author to make error returns. Fixed error variables, usually named Err… var ( ErrSomethingBad = errors.New(“some string”) ErrKindFoo = errors.New(“foo happened”) ) Error types, usually named …Error type SomeError struct { // extra information, whatever might be useful to callers // (or for making a … Read more
Whenever you use a parametrized type, including anywhere a type argument is required, like in the built-in make, you must replace the type parameters in its definition with actual types. This is called instantiation. t := make(opStack[int], 0) t = append(t, 0) A generic type must be instantiated also if you use it as a … Read more
It’s an open issue. Issue 6842: spec: Assigning to fields with short declaration notation
Yes it is possible. A html.Template is actually a set of template files. If you execute a defined block in this set, it has access to all the other blocks defined in this set. If you create a map of such template sets on your own, you have basically the same flexibility that Jinja / … Read more
Update 26th July 2019 (for go >=1.11) go run . Will work on windows as well. Original answer (for non windows environments) The code actually works. The problem was that instead of running go run main.go I should run: go run *.go
Go has multiple ways of memory allocation and value initialization: &T{…}, &someLocalVar, new, make Allocation can also happen when creating composite literals. new can be used to allocate values such as integers, &int is illegal: new(Point) &Point{} // OK &Point{2, 3} // Combines allocation and initialization new(int) &int // Illegal // Works, but it is … Read more
Goroutines run concurrently, independently, so without explicit synchronization you can’t predict execution and completion order. So as it is, you can’t pair returned numbers with the input numbers. You can either return more data (e.g. the input number and the output, wrapped in a struct for example), or pass pointers to the worker functions (launched … Read more