I can do this:
var a = [1,5,7,9,22]
a.count // 5
a[a.count - 1] // 22
a[a.endIndex - 1] // 22
but surely there's a prettier way?
6 Answers
As of beta5 there is now a first and last property
In addition to Array acquiring first and last, the lazy collections also implement first (and last if they can index bidirectionally), as well as isEmpty.
4 Comments
tim peterson
would be nice to include a link to this documentation
KML
Would be nice with an example
Glenn
Thanks for this! Interestingly, the iOS 10 master/detail template in Xcode 8.3.3 still uses code of the form x[x.count-1] -- but MUCH longer -- rather than x.last.
Update: Swift 2.0 now includes first:T? and last:T? properties built-in.
When you need to you can make the built-in Swift API's prettier by providing your own extensions, e.g:
extension Array {
var last: T {
return self[self.endIndex - 1]
}
}
This lets you now access the last element on any array with:
[1,5,7,9,22].last
6 Comments
Rudolf Adamkovič
Thanks! BTW,
endIndex doesn't need to be referenced via self.
Pang
As of Xcode6-Beta5, the
last property is built-in (as is first). It returns nil if the array is empty.
Luca Angeletti
The problem with this implementation is that it does crash if the Array is empty.
Kevin Burandt
If you ain't first you're last - Ricky Bobby
sww314
you do not need this anymore in Swift 3. See below for better answers. .last is builtin.
|
You can fetch the last element of an Array by using the last property.
Code:
let lastElement = yourArray.last
Comments
swift 5:
if let last = a.last {
print(last)
}
Comments
You can also get and remove last element from array
removeLast()
Example:
var array = [1, 2, 3]
let removed = array.removeLast()
// array is [1, 2]
// removed is 3
Taken from Apple docs (this source expired but you can find examples in this documentation page)
1 Comment
JScarry
Unlike the ObjC removeLast feature, Swift 4 isn’t smart enough to know if there are no elements left in the array and will crash if tried on an empty array.
edit for swift 2.2
extension Array {
var last: Element {
return self[self.endIndex - 1]
}
}
lastIndexvar, which available in Kotlin. Seems like I'd have to stick withendIndex - 1for now.