Switch as else if in Go

In Go, the switch statement can be used as an alternative to multiple if and else if statements. It is useful when you need to compare a single expression with multiple values.

Here is an example of how to use switch as else if:

package main
import "fmt"
func main() {

    score := 70

    var grade string
switch {

    case score >= 90:

        grade = "A"

    case score >= 80:

        grade = "B"

    case score >= 70:

        grade = "C"

    case score >= 60:

        grade = "D"

    default:

        grade = "F"

    }
fmt.Println("Your grade is", grade)

}

In this example, we are using switch to compare the variable score with multiple values. The case statements evaluate the expressions and execute the statements below them if the expression is true. The default statement will execute if none of the case statements evaluate to true.

We use an empty expression in the switch statement because we are comparing a single variable to multiple values. This is equivalent to a series of if and else if statements.

You can customize the expression you want to compare inside the switch statement. Here's an example that takes a user input and compares it with a list of predefined options:

package main
import "fmt"
func main() {

    var input string
fmt.Print("Enter your favorite color: ")

    fmt.Scanln(&input)
switch input {

    case "red":

        fmt.Println("Your favorite color is red.")

    case "green":

        fmt.Println("Your favorite color is green.")

    case "blue":

        fmt.Println("Your favorite color is blue.")

    default:

        fmt.Println("Your favorite color is not red, green, or blue.")

    }

}

In this example, we are customizing the expression inside switch to compare it with multiple possible user inputs. If the input matches one of the case statements, it will print the corresponding message. Otherwise, it will execute the default statement.