FREE: Read a new Swift article every day – click here! >>

< Previous: Infinite loops   Next: Writing functions >

Looping summary

You’ve made it to the end of the fourth part of this series, so let’s summarize:

  1. Loops let us repeat code until a condition is false.
  2. The most common loop is for, which assigns each item inside the loop to a temporary constant.
  3. If you don’t need the temporary constant that for loops give you, use an underscore instead so Swift can skip that work.
  4. There are while loops, which you provide with an explicit condition to check.
  5. Although they are similar to while loops, repeat loops always run the body of their loop at least once.
  6. You can exit a single loop using break, but if you have nested loops you need to use break followed by whatever label you placed before your outer loop.
  7. You can skip items in a loop using continue.
  8. Infinite loops don’t end until you ask them to, and are made using while true. Make sure you have a condition somewhere to end your infinite loops!

Upgrade to premium

The Hacking with Swift guide book helps you learn faster, plus get an Xcode tips and tricks video and Swift wall chart.

< Previous: Infinite loops   Next: Writing functions >
MASTER SWIFT NOW
Buy Testing Swift Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns Buy Swift Coding Challenges Buy Server-Side Swift (Vapor Edition) Buy Server-Side Swift (Kitura Edition) Buy Hacking with macOS Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with Swift Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let me know!

Average rating: 1.0/5

Click here to visit the Hacking with Swift store >>