Go - Declare Variables

Declaration

1. Declare package
2. Declare import
3. var/const/func/type can be declared in any order

Variables

Declare variables with the same type and different types

Declare variables by method return multiple values

Short Variable Declaration

Use pattern "variables := expression" can declare variables.

package main

import (

       "fmt"

)

func main() {

       i, j := 1, 2

       fmt.Printf("%d, %d", i, j)

}

Short variable declaration expression can return multiple values

package main

import (

       "fmt"

)

func main() {

       q, k := multiReturn()

       fmt.Printf("%d, %d", q, k)

}

func multiReturn() (int, int) {

       return 3, 4

}

Must declare at least one new variable!

package main

import (

       "fmt"

)

// Declare new variable "q"

func main() {

       i, j := 1, 2

       j, q := i, j 

       fmt.Printf("i=%d,j=%d,q=%d", i, j, q)

}

Otherwise it will compile error