Break statements, The Go Programming Language Specification. A “break” statement terminates execution of the innermost “for”, “switch” or “select” statement. BreakStmt = “break” [ Label ] . If there is a label, it must be that of an enclosing “for”, “switch” or “select” statement, and that is the one whose execution terminates (§For statements, §Switch … Read more
You can unmarshall bottom half in json.RawMessage first, something like package main import ( “encoding/json” “fmt” ) type Message struct { Code int Payload json.RawMessage // delay parsing until we know the code } type Range struct { Start int End int } type User struct { ID int Pass int } func MyUnmarshall(m []byte) … Read more
There are 2 template packages, text/template and html/template. They have the same interface, but the html/template package is for generating HTML output safe against code injection, and should be used instead of text/template whenever the output is HTML. Since they have the same interface but the html/template provides some extra functionality (contextual escaping of the … Read more
Though maps and slices in go are generic themselves, they are not covariant (nor could they be, since interfaces aren’t generics). It’s part of working with a language that doesn’t have generics, you will have to repeat some things. If you really just need to get the keys of any old map, you can use … Read more
You don’t need to make new slices, just append slices of logs to the divided slice. http://play.golang.org/p/vyihJZlDVy var divided [][]string chunkSize := (len(logs) + numCPU – 1) / numCPU for i := 0; i < len(logs); i += chunkSize { end := i + chunkSize if end > len(logs) { end = len(logs) } divided … Read more
Note: As of Go 1.5, GOMAXPROCS is set to the number of cores of the hardware: golang.org/doc/go1.5#runtime, below the original answer before 1.5. When you run Go program without specifying GOMAXPROCS environment variable, Go goroutines are scheduled for execution in single OS thread. However, to make program appear to be multithreaded (that’s what goroutines are … Read more
Your code is idiomatic and in my opinion it is the best practice available. Some would disagree for sure, but I would argue that this is the style seen all over the standard libraries in Golang. In other words, Go authors write error handling in this way.
Instantiating a generic type with different type arguments produces two new different named types. Note that every time you supply a type argument, including in function arguments or return types, you are instantiating the generic type: // Props is instantiated with type argument ‘Generic’ func Problem() Props[Generic] { return ExampleProps } Therefore Props[Example] is just … Read more
A core type, for an interface (including an interface constraint) is defined as follows: An interface T has a core type if one of the following conditions is satisfied: There is a single type U which is the underlying type of all types in the type set of T or the type set of T … Read more
You need a Handler or a HandlerFunc which will send the file content (jquery.min.js) to the web browser when requested. You have 3 options: Doing It Manually This is the more complex solution. It would look like in your handler function you read the content of the file, set proper response content type (application/javascript) and … Read more