title: Arrays
Arrays
Arrays are a collection type that stores elements of the same type in an ordered list.
Initialization
//create immutable array.
let oddNumbers: [Int] = [1,3,5,7,9];
let evenNumbers = [2,4,6,8];
//create an empty mutable array
var numbers = [Int]();
Modification
Add a single element to an array
let someNumber = 0
numbers.append(someNumber)
Add multiple elements to an array
numbers += oddNumbers numbers.append(contentsOf: evenNumbers)
Remove and Insert at Index
//remove element from an array at index
let removedInt = numbers.remove(at: 4)
//insert element at specific index
numbers.insert(removedInt, at: 4)
Iteration
You can iterate over a set using a for-in loop. Below are two different ways to do essentially the same thing.
var showNumbers = ""
numbers = numbers.sorted() //sort the numbers in ascending order
for i in 0..<numbers.count {
showNumbers += "\(numbers[i]) "
}
print(showNumbers);
showNumbers = ""
for i in numbers {
showNumbers += "\(numbers[i]) "
}
print(showNumbers);
The output(s) for the above are “0 1 2 3 4 5 6 7 8 9”