Solution 10 - Go

Author: hozlucas28

Roadmap/10 - EXCEPCIONES/go/hozlucas28.go

@@ -0,0 +1,130 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+)
+
+/* -------------------------------------------------------------------------- */
+/*                                ERROR (CLASS)                               */
+/* -------------------------------------------------------------------------- */
+
+type Error struct {
+	errorMessage  string
+	errorSeverity string
+}
+
+func (error *Error) Error() string {
+	var errorSeverity string = fmt.Sprintf("Error severity: %s", error.errorSeverity)
+	var errorMessage string = fmt.Sprintf("\nError message: %s", error.errorMessage)
+	return errorSeverity + errorMessage
+}
+
+/* -------------------------------------------------------------------------- */
+/*                                  FUNCTIONS                                 */
+/* -------------------------------------------------------------------------- */
+
+func divide(a int, b int) (int, error) {
+	if b == 0 {
+		var errorMessage string = fmt.Sprintf("Can't divide %d by %d value!", a, b)
+		return 0, errors.New(errorMessage)
+	}
+
+	return a / b, nil
+}
+
+func at[T any](array *[]T, index int) (T, error) {
+	var arrayLength int = len(*array)
+	if arrayLength <= index {
+		var emptyValue T
+		var errorMessage string = fmt.Sprintf("Index out of range! It must be less than %d.", index)
+		return emptyValue, errors.New(errorMessage)
+	}
+
+	return (*array)[index], nil
+}
+
+func fn(a int, b int) (int, error) {
+	if a == 0 {
+		return 0, errors.New("First parameter mustn't be zero!")
+	}
+
+	if b == 0 {
+		return 0, errors.New("Second parameter mustn't be zero!")
+	}
+
+	if a < 0 || b < 0 {
+		return 0, &Error{errorMessage: "First parameter and second parameter must be greater than zero!", errorSeverity: "high"}
+	}
+
+	return a + b, nil
+}
+
+/* -------------------------------------------------------------------------- */
+/*                                    MAIN                                    */
+/* -------------------------------------------------------------------------- */
+
+func main() {
+	/*
+		Exceptions...
+	*/
+
+	fmt.Println("Exceptions...")
+
+	division, divisionError := divide(10, 0)
+	if divisionError != nil {
+		fmt.Printf("\n%s\n", divisionError.Error())
+	} else {
+		fmt.Printf("\n%d / %d --> %d\n", 10, 0, division)
+	}
+
+	var array []string = []string{"Hello", "World", "!"}
+	element, elementError := at(&array, 3)
+	if elementError != nil {
+		fmt.Printf("\n%s\n", elementError.Error())
+	} else {
+		fmt.Printf("\narray[3] --> %s\n", element)
+	}
+
+	fmt.Println("\n# ---------------------------------------------------------------------------------- #\n")
+
+	/*
+		Additional challenge...
+	*/
+
+	fmt.Println("Additional challenge...")
+
+	// Custom error
+	result01, result01Error := fn(-2, -2)
+	if result01Error != nil {
+		fmt.Printf("\n%s\n", result01Error.Error())
+	} else {
+		fmt.Printf("\nFirst result --> %d\n", result01)
+	}
+
+	// First parameter error
+	result02, result02Error := fn(0, 5)
+	if result02Error != nil {
+		fmt.Printf("\n%s\n", result02Error.Error())
+	} else {
+		fmt.Printf("\nSecond result --> %d\n", result02)
+	}
+
+	// No error
+	result03, result03Error := fn(5, 10)
+	if result03Error != nil {
+		fmt.Printf("\n%s\n", result03Error.Error())
+	} else {
+		fmt.Printf("\nThird result --> %d\n", result03)
+	}
+
+	// Second parameter error
+	result04, result04Error := fn(8, 0)
+	if result04Error != nil {
+		fmt.Printf("\n%s\n", result04Error.Error())
+	} else {
+		fmt.Printf("\nFourth result --> %d\n", result04)
+	}
+
+	fmt.Println("\nAdditional challenge finished!")
+}