Array length swift

Array length swift DEFAULT

Get Array Size in Swift

Swift – Array Size

Welcome to Swift Tutorial. In this tutorial, we will learn how to get the size of an array in Swift.

To get the size of an array in Swift, use count function on the array.

Following is a quick example to get the count of elements present in the array.

array_name.count

is the array variable name.

returns an integer value for the size of this array.

Example 1 – Get the size of an Array in Swift using count function

In the following example, we have two arrays. First array is empty. Second array is an integer array with three elements.

main.swift

var values:[Int] = [] print( "size of values is : \(values.count)" ) var numbers:[Int] = [7, 54, 21] print( "size of numbers is : \(numbers.count)" )

Output

size of values is : 0 size of numbers is : 3

Conclusion

In this Swift Tutorial, we have learned to get the size of the array or count the number of elements in the array using Swift example programs.

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How to get the length of an array in Swift

In this tutorial, we are going to learn about how to find the length of an array in Swift.

The length of an array means, the total number of elements present in the given array.

Getting the array length

To get the length of an array, we can use the built-in property in Swift language.

Here is an example:

Output:

Similarly, we can also use for loop to calculate the length of an array in swift.

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Swift - Arrays



Swift 4 arrays are used to store ordered lists of values of the same type. Swift 4 puts strict checking which does not allow you to enter a wrong type in an array, even by mistake.

If you assign a created array to a variable, then it is always mutable, which means you can change it by adding, removing, or changing its items; but if you assign an array to a constant, then that array is immutable, and its size and contents cannot be changed.

Creating Arrays

You can create an empty array of a certain type using the following initializer syntax −

var someArray = [SomeType]()

Here is the syntax to create an array of a given size a* and initialize it with a value −

var someArray = [SomeType](count: NumbeOfElements, repeatedValue: InitialValue)

You can use the following statement to create an empty array of Int type having 3 elements and the initial value as zero −

var someInts = [Int](count: 3, repeatedValue: 0)

Following is one more example to create an array of three elements and assign three values to that array −

var someInts:[Int] = [10, 20, 30]

Accessing Arrays

You can retrieve a value from an array by using subscript syntax, passing the index of the value you want to retrieve within square brackets immediately after the name of the array as follows −

var someVar = someArray[index]

Here, the index starts from 0 which means the first element can be accessed using the index as 0, the second element can be accessed using the index as 1 and so on. The following example shows how to create, initialize, and access arrays −

var someInts = [Int](count: 3, repeatedValue: 10) var someVar = someInts[0] print( "Value of first element is \(someVar)" ) print( "Value of second element is \(someInts[1])" ) print( "Value of third element is \(someInts[2])" )

When the above code is compiled and executed, it produces the following result −

Value of first element is 10 Value of second element is 10 Value of third element is 10

Modifying Arrays

You can use append() method or addition assignment operator (+=) to add a new item at the end of an array. Take a look at the following example. Here, initially, we create an empty array and then add new elements into the same array −

Live Demo

var someInts = [Int]() someInts.append(20) someInts.append(30) someInts += [40] var someVar = someInts[0] print( "Value of first element is \(someVar)" ) print( "Value of second element is \(someInts[1])" ) print( "Value of third element is \(someInts[2])" )

When the above code is compiled and executed, it produces the following result −

Value of first element is 20 Value of second element is 30 Value of third element is 40

You can modify an existing element of an Array by assigning a new value at a given index as shown in the following example −

Live Demo

var someInts = [Int]() someInts.append(20) someInts.append(30) someInts += [40] // Modify last element someInts[2] = 50 var someVar = someInts[0] print( "Value of first element is \(someVar)" ) print( "Value of second element is \(someInts[1])" ) print( "Value of third element is \(someInts[2])" )

When the above code is compiled and executed, it produces the following result −

Value of first element is 20 Value of second element is 30 Value of third element is 50

Iterating Over an Array

You can use for-in loop to iterate over the entire set of values in an array as shown in the following example −

Live Demo

var someStrs = [String]() someStrs.append("Apple") someStrs.append("Amazon") someStrs += ["Google"] for item in someStrs { print(item) }

When the above code is compiled and executed, it produces the following result −

Apple Amazon Google

You can use enumerate() function which returns the index of an item along with its value as shown below in the following example −

Live Demo

var someStrs = [String]() someStrs.append("Apple") someStrs.append("Amazon") someStrs += ["Google"] for (index, item) in someStrs.enumerated() { print("Value at index = \(index) is \(item)") }

When the above code is compiled and executed, it produces the following result −

Value at index = 0 is Apple Value at index = 1 is Amazon Value at index = 2 is Google

Adding Two Arrays

You can use the addition operator (+) to add two arrays of the same type which will yield a new array with a combination of values from the two arrays as follows −

var intsA = [Int](count:2, repeatedValue: 2) var intsB = [Int](count:3, repeatedValue: 1) var intsC = intsA + intsB for item in intsC { print(item) }

When the above code is compiled and executed, it produces the following result −

2 2 1 1 1

The count Property

You can use the read-only count property of an array to find out the number of items in an array shown below −

var intsA = [Int](count:2, repeatedValue: 2) var intsB = [Int](count:3, repeatedValue: 1) var intsC = intsA + intsB print("Total items in intsA = \(intsA.count)") print("Total items in intsB = \(intsB.count)") print("Total items in intsC = \(intsC.count)")

When the above code is compiled and executed, it produces the following result −

Total items in intsA = 2 Total items in intsB = 3 Total items in intsC = 5

The empty Property

You can use the read-only empty property of an array to find out whether an array is empty or not as shown below −

var intsA = [Int](count:2, repeatedValue: 2) var intsB = [Int](count:3, repeatedValue: 1) var intsC = [Int]() print("intsA.isEmpty = \(intsA.isEmpty)") print("intsB.isEmpty = \(intsB.isEmpty)") print("intsC.isEmpty = \(intsC.isEmpty)")

When the above code is compiled and executed, it produces the following result −

intsA.isEmpty = false intsB.isEmpty = false intsC.isEmpty = true
Sours: https://www.tutorialspoint.com/swift/swift_arrays.htm
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