Golang : Variadic function arguments sanity check example
Problem:
Golang is cool and you love to use variadic function frequently. You have a variadic function such as a totalizer functions that accept any number of arguments. Such as
func variadicFunction(arguments ...int) {}
Somehow a user of your program or variadic function managed to sneak in a null/nil or empty argument. This caused your variadic function to go crazy.
How to prevent this from happening?
Solution:
You want to perform sanity check on your users and their input arguments first before processing further. For example :
package main
import "fmt"
func totalizer(values ...int) {
if values == nil {
fmt.Println("boom! - no number in arguments")
//panic("kaboom") -- if you choose to kill the program
} else {
fmt.Print(values, " ")
total := 0
for _, value := range values {
total += value
}
fmt.Println(total)
}
}
func main() {
totalizer(2)
totalizer(1, 2, 3)
totalizer()
}
Output:
[2] 2
[1 2 3] 6
boom! - no values given in arguments
Happy coding and don't let your user bomb your program!
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+18.1k Golang : Check if a directory exist or not
+26k Golang : How to read integer value from standard input ?
+14k Generate salted password with OpenSSL example
+5.9k Javascript : How to replace HTML inside <div>?
+18.9k Golang : How to make function callback or pass value from function as parameter?
+14.3k Golang : Fix image: unknown format error
+52.7k Golang : How to get struct field and value by name
+25.3k Golang : Storing cookies in http.CookieJar example
+10.2k Golang : Check a web page existence with HEAD request example
+13.8k Golang : Tutorial on loading GOB and PEM files
+9.4k Golang : How to get username from email address
+7.4k Golang : How to fix html/template : "somefile" is undefined error?