Variables

All variables in Go are strongly typed meaning you have to declare the data type, for example:

var firstName string
var firstName string = "Richard"

The shorthand version of the above is to let Go infer the type, and use the := syntax to declare and set the value of a variable:

firstName := "Richard"

Type Conversion

Be clear over being cleaver!

In Go you need to explicitly convert types, for example:

var price int = 48
var total float32

total = float32(price)

Some examples:

main.go

package main

import "fmt"

func main() {
    var a string = "foo"
    fmt.Println(a)

    var b int = 42
    fmt.Println(b)

    var c = true
    fmt.Println(c)

    d := 3.1415
    fmt.Println(d)

    var e int = int(d)
    fmt.Println(e)
}

Arithmetic

Multi variables can be delard on one line:

a, b := 5, 6

c := a + b  // addition
c := a - b  // subtraction
c := a * b  // multiplication 
c := a / b  // division
c := a % 3  // modulus

Comparisons

a, b := 5, 6

c := a == b     // false
c := a != b     // true
c := a < b      // false
c := a <= b     // false
c := a > b      // true
c := a >= b     // true

Examples:

main.go

package main

import "fmt"

func main() {
    a, b := 5, 2

    fmt.Println(a + b)
    fmt.Println(a - b)
    fmt.Println(a * b)
    fmt.Println(a / b)
    fmt.Println(a % b)

    fmt.Println(float32(a) / float32(b))

    fmt.Println(a == b)
    fmt.Println(a < b)
    fmt.Println(a > b)
}