Exploring Golang Variable Declarations

Introduction

This lab aims to test your understanding of variables in Golang. In Golang, variables are explicitly declared and used by the compiler to check the type-correctness of function calls.

Variables

You are required to complete the code to declare and initialize variables of different types in Golang.

• Basic knowledge of Golang syntax
• Familiarity with variable declaration and initialization in Golang

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

There is the full code below:

// 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 = "apple"` in this case.
    // This syntax is only available inside functions.
    f := "apple"
    fmt.Println(f)
}

Summary

This lab tests your ability to declare and initialize variables of different types in Golang. By completing this lab, you will have a better understanding of how to work with variables in Golang.