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How to check if an array is empty in Swift?

In Swift, you can check if an array is empty by using the isEmpty property of the array. This property returns a Boolean value that indicates whether the array is empty.

Here's how you can use it:

let array = [Int]()

if array.isEmpty {
    print("The array is empty.")
} else {
    print("The array is not empty.")
}

In this example, the output will be "The array is empty."

Using isEmpty is more idiomatic and can be more performant than checking if the count of the array is 0, especially for other collection types where determining the count might be a more expensive operation.

Swift check if array is empty:

To check if an array is empty, you can use various methods and conditional statements.

Example:

let myArray = [Int]()
if myArray.isEmpty {
    print("The array is empty.")
} else {
    print("The array is not empty.")
}

How to determine if an array is empty in Swift:

Use the isEmpty property of the array to determine if it is empty.

Example:

let myArray = [String]()
if myArray.isEmpty {
    print("The array is empty.")
} else {
    print("The array is not empty.")
}

Checking if array is not empty in Swift:

Use the negation (!) of the isEmpty property to check if an array is not empty.

Example:

let myArray = ["Apple", "Banana"]
if !myArray.isEmpty {
    print("The array is not empty.")
} else {
    print("The array is empty.")
}

Swift array isEmpty method:

The isEmpty property is a convenient method to check if an array is empty.

Example:

let myArray = [Double]()
if myArray.isEmpty {
    print("The array is empty.")
} else {
    print("The array is not empty.")
}

Conditional statements for empty arrays in Swift:

Use conditional statements like if to check the condition of an empty array.

Example:

let myArray = ["One", "Two", "Three"]
if myArray.isEmpty {
    print("The array is empty.")
} else {
    print("The array is not empty.")
}

Swift if statement with array count check:

Check the count of the array using the count property in an if statement.

Example:

let myArray = [1, 2, 3, 4, 5]
if myArray.count > 0 {
    print("The array is not empty.")
} else {
    print("The array is empty.")
}

Guard statement for non-empty arrays in Swift:

Use the guard statement to exit early if an array is empty.

Example:

let myArray = [String]()
guard !myArray.isEmpty else {
    print("The array is empty.")
    return
}
print("The array is not empty.")

Swift array optional binding and emptiness check:

Use optional binding (if let) to safely unwrap an optional array and check if it is not empty.

Example:

var optionalArray: [Int]? = [1, 2, 3]
if let unwrappedArray = optionalArray, !unwrappedArray.isEmpty {
    print("The array is not empty.")
} else {
    print("The array is empty or nil.")
}

Using count property to check array size in Swift:

Use the count property to check the size of the array.

Example:

let myArray = ["A", "B", "C"]
if myArray.count > 0 {
    print("The array is not empty.")
} else {
    print("The array is empty.")
}

Handling optional arrays in Swift with isEmpty:

Use optional binding and the isEmpty property to handle optional arrays.

Example:

var optionalArray: [String]? = nil
if let unwrappedArray = optionalArray, !unwrappedArray.isEmpty {
    print("The array is not empty.")
} else {
    print("The array is empty or nil.")
}

Swift empty array condition:

Check if an array is empty using the isEmpty property.

Example:

let myArray = [Bool]()
if myArray.isEmpty {
    print("The array is empty.")
} else {
    print("The array is not empty.")
}

Checking for nil and empty arrays in Swift:

Use optional binding to check if an array is not nil and not empty.

Example:

var optionalArray: [Double]? = [1.0, 2.0, 3.0]
if let unwrappedArray = optionalArray, !unwrappedArray.isEmpty {
    print("The array is not empty.")
} else {
    print("The array is empty or nil.")
}

Swift compactMap and checking for empty arrays:

Use compactMap to filter out nil values and then check if the resulting array is empty.

Example:

let mixedArray: [Int?] = [1, nil, 3, nil, 5]
let nonNilArray = mixedArray.compactMap { $0 }
if nonNilArray.isEmpty {
    print("The array is empty or contains only nil values.")
} else {
    print("The array is not empty and contains non-nil values.")
}