Overview

Println

Print with default formatting.

Spaces are always added between operands and a newline is appended.

name := "World"
fmt.Println("Hello", name)
// Hello Gopher

In Python:

name = "World"
print("Hello", name)

Equivalent in JS:

name = "World"
console.log("Hello", name");

Print

Same as Println, except without the newline.

e.g.

name := "World"
fmt.Print("Hello", name)
fmt.Print("Goodbye", name)
// Hello GopherGoodbye Gopher

Printf

Print with formatting specifier. See more info in Format.

Note use of %v to substitute variable inside the string.

Remember to add the newline character yourself.

name := "World"
fmt.Printf("Hello %v!\n", name)
// Hello, World!

The printf name also used in C and Bash.

Equivalent in Python:

name = "World"
print(f"Hello {name}")

Equivalent in JS:

name = "World"
console.log(`Hello ${name}`);

You can use Printf without any variables, but you have to remember to add the newline so then you are probably better off using Println.

fmt.Printf("Hello\n")
// Hello

Sprintf

This formats a string and returns it, without actually printing it.

From the docs:

func Sprintf(format string, a ...interface{}) string

Sprintf formats according to a format specifier and returns the resulting string.

package main

import (
	"fmt"
	"io"
	"os"
)

func main() {
	const name, age = "Kim", 22
	s := fmt.Sprintf("%s is %d years old.\n", name, age)
	io.WriteString(os.Stdout, s)
}

Fprintln

Print to an io.Writer instance.

e.g.

fmt.Fprintln(os.Stdout, e) 
fmt.Fprintln(os.Stdout, "a", 12, "b", 12.0)

Fprint

As above but without newline.