Variables

In Go, variables are explicitly declared and used by the compiler to e.g. check type-correctness of function calls.

package main

import "fmt"

func main() {
    
    // var declares one or more variables.
    var a = "initial"
    fmt.Println(a)

    // You can declare multiple variables at once.
    var b, c int = 1, 2
    fmt.Println(b, c)

    // Go will infer the type of initialized variables.
    var d = true
    fmt.Println(d)

    // Variables declared without a corresponding initialization are
    // zero-valued. For example, the zero value for an int is 0.
    fmt.Println(e)

    // The := syntax is shorthand for declaring and initializing 
    // a variable, e.g. for var f string = "apple" in this case.
    f := "apple"
    fmt.Println(f)
}

$ go run variables.go
initial
1 2
true
0
apple