go

Println vs Printf vs Print in Go

I come from a land of JS and have mostly used things like console.log or console.error

Now, the tutorial I am following, the instructor over there did something like this

package main

import "fmt"



func main() {

    var FirstName = "Varun"
    var lastName = "bindal"

    fmt.Println(FirstName, lastName)
    fmt.Printf("%T", FirstName)
}

Here he did PrintF to check type instead of Println. Initially, I thought that println prints in new Line so I changed my

fmt.Printf("%T", FirstName)

to 

fmt.Println("%T", FirstName)

but this logged %T Varun instead of telling me the type.

I went to their site to figure it out and was either unable to comprehend it or wasn't able to find it out.

Googling lead me know that there are three ways to log/print in Go

  1. Println
  2. Printf
  3. Print

So, If someone call tell the difference between three of them?

Solution

  • Just as Nate said: fmt.Print and fmt.Println print the raw string (fmt.Println appends a newline)

    fmt.Printf will not print a new line, you will have to add that to the end yourself with \n.

    The way fmt.Printf works is simple, you supply a string that contains certain symbols, and the other arguments replace those symbols. For example: 

    fmt.Printf("%s is cool", "Bob")

    In this case, %s represents a string. In your case, %T prints the type of a variable.