GOPATH is discussed in the cmd/go documentation: The GOPATH environment variable lists places to look for Go code. On Unix, the value is a colon-separated string. On Windows, the value is a semicolon-separated string. On Plan 9, the value is a list. GOPATH must be set to get, build and install packages outside the standard … Read more
Both styles are used within the Go’s standard libraries. if len(s) > 0 { … } can be found in the strconv package: http://golang.org/src/pkg/strconv/atoi.go if s != “” { … } can be found in the encoding/json package: http://golang.org/src/pkg/encoding/json/encode.go Both are idiomatic and are clear enough. It is more a matter of personal taste and … Read more
Paul’s solution provides a simple, general solution. The question asks for the “the fastest and simplest way”. Let’s address the fastest part too. We’ll arrive at our final, fastest code in an iterative manner. Benchmarking each iteration can be found at the end of the answer. All the solutions and the benchmarking code can be … Read more
int32 and time.Duration are different types. You need to convert the int32 to a time.Duration: time.Sleep(time.Duration(rand.Int31n(1000)) * time.Millisecond)
There is no built-in operator to do it in Go. You need to iterate over the array. You can write your own function to do it, like this: func stringInSlice(a string, list []string) bool { for _, b := range list { if b == a { return true } } return false } Or … Read more
tl;dr: Methods using receiver pointers are common; the rule of thumb for receivers is, “If in doubt, use a pointer.” Slices, maps, channels, strings, function values, and interface values are implemented with pointers internally, and a pointer to them is often redundant. Elsewhere, use pointers for big structs or structs you’ll have to change, and … Read more
Yes assuming you have this: var WhatIsThe = AnswerToLife() func AnswerToLife() int { // 1 return 42 } func init() { // 2 WhatIsThe = 0 } func main() { // 3 if WhatIsThe == 0 { fmt.Println(“It’s all a lie.”) } } AnswerToLife() is guaranteed to run before init() is called, and init() is … Read more
This is called the ‘receiver’. In the first case (h handler) it is a value type, in the second (s *GracefulServer) it is a pointer. The way this works in Go may vary a bit from some other languages. The receiving type, however, works more or less like a class in most object-oriented programming. It … Read more
In Go 1.1 and newer the most simple way to do this is with a bufio.Scanner. Here is a simple example that reads lines from a file: package main import ( “bufio” “fmt” “log” “os” ) func main() { file, err := os.Open(“/path/to/file.txt”) if err != nil { log.Fatal(err) } defer file.Close() scanner := bufio.NewScanner(file) … Read more
As pointed out (and hopefully unsurprisingly), using if+else is indeed the idiomatic way to do conditionals in Go. In addition to the full blown var+if+else block of code, though, this spelling is also used often: index := val if val <= 0 { index = -val } and if you have a block of code … Read more