How to create an empty array in Swift?

Question

I\'m really confused with the ways we create an array in Swift. Could you please tell me how many ways to create an empty array with some detail?

Answer 1

As per Swift 5

    // An array of 'Int' elements
    let oddNumbers = [1, 3, 5, 7, 9, 11, 13, 15]

    // An array of 'String' elements
    let streets = ["Albemarle", "Brandywine", "Chesapeake"]

    // Shortened forms are preferred
    var emptyDoubles: [Double] = []

    // The full type name is also allowed
    var emptyFloats: Array<Float> = Array()

Answer 2

you can remove the array content with passing the array index or you can remove all

    var array = [String]()
    print(array)
    array.append("MY NAME")
    print(array)
    array.removeFirst()
    print(array)
    array.append("MY NAME")
    array.removeLast()
    array.append("MY NAME1")
    array.append("MY NAME2")
    print(array)
    array.removeAll()
    print(array)

Answer 3

There are 2 major ways to create/intialize an array in swift.

var myArray = [Double]()

This would create an array of Doubles.

var myDoubles = [Double](count: 5, repeatedValue: 2.0)

This would create an array of 5 doubles, all initialized with the value of 2.0.

Answer 4

Compatible with: Xcode 6.0.1+

You can create an empty array by specifying the Element type of your array in the declaration.

For example:

// Shortened forms are preferred
var emptyDoubles: [Double] = []

// The full type name is also allowed
var emptyFloats: Array<Float> = Array()

Example from the apple developer page (Array):

Hope this helps anyone stumbling onto this page.

Answer 5

You could use

var firstNames: [String] = []

Answer 6

Swift 5

There are three (3) ways to create a empty array in Swift and shorthand syntax way is always preferred.

Method 1: Shorthand Syntax

var arr = [Int]()

Method 2: Array Initializer

var arr = Array<Int>()

Method 3: Array with an Array Literal

var arr:[Int] = []

Method 4: Credit goes to @BallpointBen

var arr:Array<Int> = []