Explain array in swift.

how to remove and append data in array

In Swift, an array is a collection type that allows you to store multiple values of the same type in a single ordered list. Here's an example of how to create and use an array in Swift.

// Define an array of integers
var numbers = [1, 2, 3, 4, 5]

// Print the first element of the array
print(numbers[0]) // Output: 1

// Change the second element of the array
numbers[1] = 10

// Append a new element to the end of the array
numbers.append(6)

// Print the updated array
print(numbers) // Output: [1, 10, 3, 4, 5, 6]

In the above example, we define an array of integers numbers containing six elements using square brackets []. We then print the first element of the array using the subscript syntax [0]. We then change the second element of the array to the value 10 using the subscript syntax [1]. Next, we append a new element with the value 6 to the end of the array using the append(_:) method. Finally, we print the updated array using the print() function and see that the changes were made successfully.

Note that in Swift, arrays are mutable by default, which means you can modify their contents even after they have been created. You can also create an empty array using the [] syntax and then append elements to it as needed. Additionally, arrays can hold any type of data, including other arrays or custom objects.

how to remove and append data in array

In Swift, you can remove and append data in an array using the remove(at:) and append(_:) methods, respectively. Here's an example

// Define an array of strings
var fruits = ["Apple", "Banana", "Orange", "Mango"]

// Remove the second element ("Banana") from the array
fruits.remove(at: 1)

// Append a new element ("Grapes") to the end of the array
fruits.append("Grapes")

// Print the updated array
print(fruits) // Output: ["Apple", "Orange", "Mango", "Grapes"]

In the above example, we first define an array fruits containing four elements. We then remove the second element ("Banana") using the remove(at:) method, which takes an index as its argument. After that, we append a new element ("Grapes") to the end of the array using the append(_:) method. Finally, we print the updated array to verify that the changes were made successfully.

// Define an array of strings
var fruits = ["Apple", "Banana", "Orange", "Mango"]

// Append another array of fruits to the end of the existing array
fruits += ["Grapes", "Pineapple"]

// Print the updated array
print(fruits) // Output: ["Apple", "Banana", "Orange", "Mango", "Grapes", "Pineapple"]

In the above example, we define an array fruits containing four elements. We then append another array of fruits (["Grapes", "Pineapple"]) to the end of the existing array using the += operator. Finally, we print the updated array to verify that the changes were made successfully.

how to display all data of array in swift

// Define an array of integers
let numbers = [1, 2, 3, 4, 5]

// Display all the data of the array using a for loop
for number in numbers {
    print(number)
}

Output

1
2
3
4
5

Using the forEach method:

// Define an array of strings
let fruits = ["Apple", "Banana", "Orange", "Mango"]

// Display all the data of the array using the forEach method
fruits.forEach { fruit in
    print(fruit)
}

Output

Apple
Banana
Orange
Mango

In the above example, we define an array of strings fruits and use the forEach method to iterate through each element of the array and print it to the console.

Note that the forEach method is a higher-order function that takes a closure as its argument. The closure takes one parameter, which represents the current element of the array being processed, and performs some operation on it. In this example, we simply print the element to the console.