listing4.go

// Code listing 4: https://play.golang.org/p/1FnG0dJfxs8

// 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 1 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`.
    var e int
    fmt.Println(e)

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