Go Variable declaration

In Go, variables are explicitly declared and used by the compiler.
var declares 1 or more variables.
You can declare multiple variables at once by using comma.
Variables declared without a corresponding initialization are zero-valued. For example, the zero value for an int is 0.
The := syntax is shorthand for declaring and initializing a variable, e.g. for var f string = "watch" in this case.

Go Variable Types

In Go, there are different types of variables, for example:

int- stores integers (whole numbers), such as 111 or -111
float32- stores floating point numbers, with decimals, such as 0.99 or -0.99
string - stores text, such as "Hello World". String values are surrounded by double quotes
bool- stores boolean values could be either: true or false

Example of Variable declaration using Go

package main

import "fmt"

func main() {

    var a = "initial" // this is single value declaration
    fmt.Println(a)

    var b, c int = 1, 2 // this is multi values declaration
    fmt.Println(b, c)

    var d = true
    fmt.Println(d)

    var e int
    fmt.Println(e)

    f := "apple"
    fmt.Println(f)
}

Output of above code

initial
1 2
true
0
apple

Conclusion

In this page (written and validated by A. Gawali) you learned about Go Variable declaration . What's Next? If you are interested in completing Go tutorial, your next topic will be learning about: Go Constant.

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