Add an element to an array in Swift
As of Swift 3 / 4 / 5, this is done as follows.
To add a new element to the end of an Array.
anArray.append("This String")
To append a different Array to the end of your Array.
anArray += ["Moar", "Strings"]
anArray.append(contentsOf: ["Moar", "Strings"])
To insert a new element into your Array.
anArray.insert("This String", at: 0)
To insert the contents of a different Array into your Array.
anArray.insert(contentsOf: ["Moar", "Strings"], at: 0)
More information can be found in the "Collection Types" chapter of "The Swift Programming Language", starting on page 110.
How to add an array elements in swift?
First of all never declare a struct member as implicit unwrapped optional. If it's supposed to be optional declare it as regular optional (?
)
Second of all if a value won't change (maybe category
) declare it as constant (let
)
You can sum up the values with compactMap
and reduce
struct KeyValues {
let category : String
var amount : String
}
let sum = arrExpense.compactMap{Int($0.amount)}.reduce(0, +)
compactMap
is necessary to filter the strings which cannot be converted to Int
. Consider to use a numeric type for amount
How to add elements to an array? swift
That is simple as
uu.append(newNumber)
Using data in an array to insert elements of an array into another in Swift
insert(contentsOf:at:)
expects to be passed a collection of elements to be inserted but it's only being passed a single card.
There's another version of insert that takes a single element. The only change is removing contentsOf
.
cards.insert(playableCards[indexPath], at: playingCardLocations[indexPath])
https://developer.apple.com/documentation/swift/array/3126951-insert
Another option is to put the card into an array before inserting it, but it's unnecessary when there's a method that takes a single value.
cards.insert(contentsOf: [playableCards[indexPath]], at: playingCardLocations[indexPath])
SWIFT UI add element to array
You need to push the object rather than 3 values
push_group_array.append(push_group_row(id: 1, code: newCode, title: newTitle))
Swift Insert Element At Specific Index
This line:
if myArray.count == 0 {
only gets called once, the first time it runs. Use this to get the array length to at least the index you're trying to add:
var myArray = [String?]()
func insertElementAtIndex(element: String?, index: Int) {
while myArray.count <= index {
myArray.append("")
}
myArray.insert(element, atIndex: index)
}
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