Swift Learning notes-arrays

The array in Swift is denoted by []

1. Create an empty array

Let Emptyarr = [String] ()

Let emptyArr1: [NSNumber] = []

Both of these methods can be

2. Accessing elements

var numarr=["1", "2", "3"]

println ("first element: \ (Test1array[0])")

println ("last element: \ (test1array.last)")

3. Determine if the array is empty

Emptyarr.count ==0 or Emptyarr.isempty

4. Modifying an array

var strarr = ["A", "B", "C", "D", "E", "F", "G"]

strarr[1]= "X"

strarr[2...5]=["C", "D", "E", "F"]

Print (Strarr)

5. Array loops

for (INDEX,STR) in Strarr.enumerate () {

Print ("\ (index): \ (str)")

}

6. Array insertion

1 adding elements at the end

Strarr.append ("O")

2 Insert to specified position

Strarr.insert ("Y", atindex:1)

Print (Strarr)

7. Array Delete element

1 Delete the element at the specified position

Strarr.removeatindex (1)

2 Delete last Element

Strarr.removelast ()

Print (Strarr)

Note: Swift requires an array to be able to use two points correctly

1, the array must be initialized

2, you must specify the data type, you can assign a value to the compiler to automatically recognize the data type, or you can specify it yourself.

Swift Learning notes-arrays