Swift Tutorials

How to Clear all Key-Value Pairs from a Dictionary in Swift

How to Clear all Key-Value Pairs from a Dictionary in Swift ?

Answer

To clear all key-value pairs from a dictionary in Swift, you can use the `removeAll` method. This method removes all elements from the dictionary, making it empty.

✐ Examples

1 Clearing All Key-Value Pairs Using the `removeAll` Method

We can clear all key-value pairs from a dictionary in Swift using the `removeAll` method. This example demonstrates how to remove all elements from the dictionary and print the dictionary contents before and after the clearing operation.

For example,

We start by declaring and initializing a dictionary named myDictionary with integer keys and string values.
We print the dictionary contents before clearing.
We use the `removeAll` method to remove all key-value pairs from the dictionary.
We print the dictionary contents after clearing to confirm that it is empty.

Swift Program

var myDictionary: [Int: String] = [
    1: "One",
    2: "Two",
    3: "Three"
]

// Print the dictionary contents before clearing
print("Dictionary contents before clearing:")
for (key, value) in myDictionary {
    print("Key: \(key), Value: \(value)")
}

// Clear all key-value pairs from the dictionary
myDictionary.removeAll()

// Print the dictionary contents after clearing
print("Dictionary contents after clearing:")
for (key, value) in myDictionary {
    print("Key: \(key), Value: \(value)")
}

Output

Dictionary contents before clearing:
Key: 1, Value: One
Key: 2, Value: Two
Key: 3, Value: Three
Dictionary contents after clearing:

2 Confirming the Dictionary is Empty After Clearing

We can clear all key-value pairs from a dictionary in Swift and confirm that it is empty by checking the `isEmpty` property. This example demonstrates how to clear the dictionary and verify that it is empty.

For example,

We start by declaring and initializing a dictionary named myDictionary with integer keys and string values.
We print the dictionary contents before clearing.
We use the `removeAll` method to remove all key-value pairs from the dictionary.
We check the `isEmpty` property to confirm that the dictionary is empty.

Swift Program

var myDictionary: [Int: String] = [
    1: "One",
    2: "Two",
    3: "Three"
]

// Print the dictionary contents before clearing
print("Dictionary contents before clearing:")
for (key, value) in myDictionary {
    print("Key: \(key), Value: \(value)")
}

// Clear all key-value pairs from the dictionary
myDictionary.removeAll()

// Confirm the dictionary is empty
if myDictionary.isEmpty {
    print("The dictionary is now empty.")
} else {
    print("The dictionary is not empty.")
}

Output

Dictionary contents before clearing:
Key: 1, Value: One
Key: 2, Value: Two
Key: 3, Value: Three
The dictionary is now empty.

Summary

In this tutorial, we learned How to Clear all Key-Value Pairs from a Dictionary in Swift language with well detailed examples.

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How to Clear all Key-Value Pairs from a Dictionary in Swift