How to assign string to bytes array
Safe and simple: []byte(“Here is a string….”)
go
Format a Go string without printing?
Sprintf is what you are looking for. Example fmt.Sprintf(“foo: %s”, bar) You can also see it in use in the Errors example as part of “A Tour of Go.” return fmt.Sprintf(“at %v, %s”, e.When, e.What)
How to find the type of an object in Go?
The Go reflection package has methods for inspecting the type of variables. The following snippet will print out the reflection type of a string, integer and float. package main import ( “fmt” “reflect” ) func main() { tst := “string” tst2 := 10 tst3 := 1.2 fmt.Println(reflect.TypeOf(tst)) fmt.Println(reflect.TypeOf(tst2)) fmt.Println(reflect.TypeOf(tst3)) } Output: Hello, playground string int … Read more
How can I convert a zero-terminated byte array to string?
Methods that read data into byte slices return the number of bytes read. You should save that number and then use it to create your string. If n is the number of bytes read, your code would look like this: s := string(byteArray[:n]) To convert the full string, this can be used: s := string(byteArray[:len(byteArray)]) … Read more
What are the use(s) for struct tags in Go?
A tag for a field allows you to attach meta-information to the field which can be acquired using reflection. Usually it is used to provide transformation info on how a struct field is encoded to or decoded from another format (or stored/retrieved from a database), but you can use it to store whatever meta-info you … Read more
How to check if a file exists in Go?
To check if a file doesn’t exist, equivalent to Python’s if not os.path.exists(filename): if _, err := os.Stat(“/path/to/whatever”); errors.Is(err, os.ErrNotExist) { // path/to/whatever does not exist } To check if a file exists, equivalent to Python’s if os.path.exists(filename): Edited: per recent comments if _, err := os.Stat(“/path/to/whatever”); err == nil { // path/to/whatever exists } … Read more
How to print struct variables in console?
To print the name of the fields in a struct: fmt.Printf(“%+v\n”, yourProject) From the fmt package: when printing structs, the plus flag (%+v) adds field names That supposes you have an instance of Project (in ‘yourProject‘) The article JSON and Go will give more details on how to retrieve the values from a JSON struct. … Read more
Optional Parameters in Go?
Go does not have optional parameters nor does it support method overloading: Method dispatch is simplified if it doesn’t need to do type matching as well. Experience with other languages told us that having a variety of methods with the same name but different signatures was occasionally useful but that it could also be confusing … Read more
How to convert an int value to string in Go?
Use the strconv package’s Itoa function. For example: package main import ( “strconv” “fmt” ) func main() { t := strconv.Itoa(123) fmt.Println(t) } You can concat strings simply by +‘ing them, or by using the Join function of the strings package.
What is an idiomatic way of representing enums in Go?
Quoting from the language specs:Iota Within a constant declaration, the predeclared identifier iota represents successive untyped integer constants. It is reset to 0 whenever the reserved word const appears in the source and increments after each ConstSpec. It can be used to construct a set of related constants: const ( // iota is reset to … Read more