What is the Sprintln function in golang?

The Sprintln function in the Go programming language generates and returns a formatted string. Sprintln does not support custom format specifiers, which means only that the default formats are used to format the string. It also automatically adds spaces between all values passed as arguments regardless of data type, and a newline is added at the end of the formatted string.

To use the Sprintln function, we need to import the fmt Go package that stores the definition of this function. We access the function in the package using the . notation: fmt.Sprintln.

Function definition

The definition of the Sprintln function inside the fmt package is as follows:

Parameters

fmt.Sprintln takes only a list of a variable number of arguments a ...interface{}, which contains a list of all arguments that need to be formatted and returned as a string.

Return values

The fmt.Sprintln function returns just a single string that it has formatted.

Example

The following example is a simple program where we first generate a new string using the Sprintln function and print out to the standard output using the print function.

package main
import (
	"fmt"
)
func main() {
  // declaring variables of different datatypes
  var message string = "Hello and welcome to"
  var year int = 2021
  // temporary buffer
  var temp string
  temp = fmt.Sprintln(message, year)
	// printing out the declared variables as a single string
  fmt.Print(temp)
}

The example above observes how space is added between our string variable and our integer variable when it is formatted and stored into temp. This is what makes it different from the Sprint function.

The following example adds another non-string variable to the Sprintln arguments:

package main
import (
	"fmt"
)
func main() {
  // declaring variables of different datatypes
  var message string = "Hello and welcome to july"
  var day int = 12
  var year int = 2021
  // temporary buffer
  var temp string
  temp = fmt.Sprintln(message, day, year)
	// printing out the declared variables as a single string
  fmt.Print(temp)
  
}

We do not need to place and space characters ourselves, as the Sprintln function adds these spaces automatically, regardless of the data type of its arguments.

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