How to swap two items in an array using swapAt()
If you need to have two items in an array change places, the swapAt() method is exactly what you want: provide it two indexes inside your array, and the items at those positions will be swapped.
For example, consider this array:
var names = ["Paul", "John", "George", "Ringo"]If I wanted John and Paul to swap places, I’d swap positions 0 and 1, like this:
names.swapAt(0, 1)Note: swapAt() will trigger a fatal error if you try to swap beyond the length of the array.
Available from iOS 8.0
Did this solution work for you? Please pass it on!
Other people are reading…
- How to throw errors using strings
- How to make array access safer using a custom subscript
- What is a CGFloat?
- Using stride() to loop over a range of numbers
- How to convert Data to a String
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
Upgrade your apps!
Take on Core ML, ARKit, PDFKit, Core NFC, and more all in one book that's packed with practical projects!
