Go Get Going

Note: In Go, any executable code belongs to the main package.

Hello world in go: 🚀

package main
import("fmt")

func main(){
fmt.println("Hello world")
}

Go Statements: 🧾

• Hitting the Enter key adds ";" to the end of the line implicitly (does not show up in the source code).

• The left curly bracket { cannot come at the start of a line.

Go Variable Types: 🎶

• Declaring (Creating) Variables:

  1. with var keyword followed by variable name and type ==syntax:

    var variableName type = value
    //**Note:** You always have to specify either `type` or `value` (or both).

2. with `:=`

🧑‍💻 variableName := value

• with := compiler decides the type of the variable at runtime

• not possible to declare variable using := without assining value to it

• Declare Multiple var in single line: ⬇️

package main  
import ("fmt")

func main(){
    var a,b,c int = 1,2,3 //**Note:** If you use the `type` keyword, it is only possible to declare **one type** of variable per line.
    var x, y = 6, "Hello"  
  e, d := 7, "World!"

    fmt.println(a)
    fmt.println(b)
    fmt.println(c)
}

• Declare in a block : ⬇️

package main
import ("fmt")

func main(){
    var (
        a int
        b int = 1
        c string = "hello world"
    )
}

Go Variable Naming Rules: 📏📐

• variable cannot start with a number

  ❌ var 3age

• only alpha-numeric characters and underscores

  ✅ *(a-z, A-Z, 0-9, and _ ) are allowed

• variable name cannot have spaces

  ❌ var na me := "foo"

• variable name cannot be any Go keywords