Validation Errors

A command can validate input and report a message instead of exiting the process.

validation_errors.go

package main

import "fmt"

func validateCount(count int) string {
	if count < 1 {
		return "count must be at least 1"
	}
	if count > 5 {
		return "count must be 5 or less"
	}
	return "ok"
}

func main() {
	var count = 
	message := validateCount(count)
	allowed := message == "ok"

	fmt.Println("count=", count)
	fmt.Println("allowed=", allowed)
	fmt.Println("message=", message)
}

package main

import "fmt"

func validateCount(count int) string {
	if count < 1 {
		return "count must be at least 1"
	}
	if count > 5 {
		return "count must be 5 or less"
	}
	return "ok"
}

func main() {
	var count = 
	message := validateCount(count)
	allowed := message == "ok"

	fmt.Println("count=", count)
	fmt.Println("allowed=", allowed)
	fmt.Println("message=", message)
}

package main

import "fmt"

func validateCount(count int) string {
	if count < 1 {
		return "count must be at least 1"
	}
	if count > 5 {
		return "count must be 5 or less"
	}
	return "ok"
}

func main() {
	var count = 
	message := validateCount(count)
	allowed := message == "ok"

	fmt.Println("count=", count)
	fmt.Println("allowed=", allowed)
	fmt.Println("message=", message)
}

validation Validation checks whether a value is acceptable before the program uses it.