How do you declare variables in Go?

In Go, you can declare a single variable, multiple variables, or declare and initialize the variable(s) at the same time. Here’s an overview:

1. Single variable declaration:

To declare a single variable, you use the ‘var‘ keyword followed by the variable name and its type. The syntax looks like:

var variable-name variable-type

For example, to declare an integer variable named ‘x‘, you would write:

var x int

2. Multiple variable declaration:

To declare multiple variables, you can use the same ‘var‘ keyword along with parentheses ‘()‘ and list the name and type of each variable, separated by commas.

var (
    variable1-name variable1-type
    variable2-name variable2-type
    ...
)

For example, to declare an integer variable ‘x‘ and a string variable ‘s‘, you would write:

var (
    x int
    s string
)

3. Variable declaration and initialization:

If you want to declare and initialize a variable, you can still use the ‘var‘ keyword, but now you also assign an initial value with an equal sign ‘=‘.

var variable-name variable-type = value

For example, to declare and initialize an integer variable ‘x‘ with the value ‘10‘, you would write:

var x int = 10

Alternatively, you can use the short variable declaration operator ‘:=‘. This allows you to declare and initialize a variable without explicitly specifying the type, as Go will infer the variable’s type based on its value. The syntax looks like:

variable-name := value

For example, to declare and initialize an integer variable ‘x‘ with the value ‘10‘, you would write:

x := 10

Note: The short variable declaration operator can only be used inside a function. For package-level variables, you must use the ‘var‘ keyword.