Notice: Undefined index: understanding-swift in /var/sites/hackingwithswift.com/site/src/Controller/NewBooksReadController.php on line 89
How many parameters should a function accept? - a free tutorial

NEW: Subscribe to Hacking with Swift+ and accelerate your learning! >>

How many parameters should a function accept?

Paul Hudson    @twostraws   

At first glance, this question seems like “how long is a piece of a string?” That is, it’s something where there is no real, hard answer – a function could take no parameters or take 20 of them.

That’s certainly true, but when a function takes many parameters – perhaps six or more, but this is extremely subjective – you need to start asking whether that function is perhaps doing a bit too much work.

  • Does it need all six of those parameters?
  • Could that function be split up into smaller functions that take fewer parameters?
  • Should those parameters be grouped somehow?

We’ll look at some techniques for solving this later on, but there’s an important lesson to be learned here: this is called a “code smell” – something about our code that suggests an underlying problem in the way we’ve structured our program.

Hacking with Swift is sponsored by Instabug

SPONSORED Are you tired of wasting time debugging your Swift app? Instabug’s SDK is here to help you minimize debugging time by providing you with complete device details, network logs, and reproduction steps with every bug report. All data is attached automatically, and it only takes a line of code to setup. Start your free trial now and get 3 months off exclusively for the Hacking with Swift Community.

Start your free trial!

Sponsor Hacking with Swift and reach the world's largest Swift community!

BUY OUR BOOKS
Buy Pro Swift Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Coding Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift (Vapor Edition) Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Advanced iOS Volume Three Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with macOS Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Server-Side Swift (Kitura Edition) Buy Beyond Code

Was this page useful? Let us know!

Link copied to your pasteboard.