How to Convert an Array of Key-Value Pairs to a Dictionary in Swift - Step by Step Examples

How to Convert an Array of Key-Value Pairs to a Dictionary in Swift ?

Answer

To convert an array of key-value pairs to a dictionary in Swift, you can use the `Dictionary(uniqueKeysWithValues:)` initializer. This allows you to create a dictionary from a collection of key-value pairs stored in an array.

✐ Examples

1 Converting an Array of Tuples to a Dictionary

We can convert an array of key-value pairs to a dictionary in Swift using the `Dictionary(uniqueKeysWithValues:)` initializer. This example demonstrates how to declare and initialize an array of key-value pairs, use the `Dictionary(uniqueKeysWithValues:)` initializer to convert the array to a dictionary, and print the resulting dictionary.

For example,

We start by declaring and initializing an array of key-value pairs named pairs. In this example, the pairs are represented as tuples with two elements: a key and a value.
We use the `Dictionary(uniqueKeysWithValues:)` initializer to convert the array to a dictionary.
We print the resulting dictionary.

Swift Program

let pairs = [(1, 10), (2, 20), (3, 30)]

// Convert the array to a dictionary using Dictionary(uniqueKeysWithValues:)
let myDictionary = Dictionary(uniqueKeysWithValues: pairs)

// Print the resulting dictionary
print("Dictionary from array of tuples:")
for (key, value) in myDictionary {
    print("Key: \(key), Value: \(value)")
}

Output

Dictionary from array of tuples:
Key: 1, Value: 10
Key: 2, Value: 20
Key: 3, Value: 30

2 Converting an Array of KeyValuePairs to a Dictionary

We can convert an array of `KeyValuePair` to a dictionary in Swift using the `Dictionary(uniqueKeysWithValues:)` initializer. This example demonstrates how to declare and initialize an array of `KeyValuePair`, use the `Dictionary(uniqueKeysWithValues:)` initializer to convert the array to a dictionary, and print the resulting dictionary.

For example,

We start by declaring and initializing an array of `KeyValuePair` named pairs.
We use the `Dictionary(uniqueKeysWithValues:)` initializer to convert the array to a dictionary.
We print the resulting dictionary.

Swift Program

let pairs: [KeyValuePairs<Int, Int>.Element] = [(1, 10), (2, 20), (3, 30)]

// Convert the array to a dictionary using Dictionary(uniqueKeysWithValues:)
let myDictionary = Dictionary(uniqueKeysWithValues: pairs)

// Print the resulting dictionary
print("Dictionary from array of KeyValuePair:")
for (key, value) in myDictionary {
    print("Key: \(key), Value: \(value)")
}

Output

Dictionary from array of KeyValuePair:
Key: 1, Value: 10
Key: 2, Value: 20
Key: 3, Value: 30

3 Converting an Array of Arrays to a Dictionary

We can convert an array of arrays to a dictionary in Swift using the `Dictionary(uniqueKeysWithValues:)` initializer. This example demonstrates how to declare and initialize an array of arrays, use the `Dictionary(uniqueKeysWithValues:)` initializer to convert the array to a dictionary, and print the resulting dictionary.

For example,

We start by declaring and initializing an array of arrays named pairs. In this example, the arrays contain two elements: a key and a value.
We use the `Dictionary(uniqueKeysWithValues:)` initializer to convert the array to a dictionary.
We print the resulting dictionary.

Swift Program

let pairs = [[1, 10], [2, 20], [3, 30]]

// Convert the array to a dictionary using Dictionary(uniqueKeysWithValues:)
let myDictionary = Dictionary(uniqueKeysWithValues: pairs.map { ($0[0], $0[1]) })

// Print the resulting dictionary
print("Dictionary from array of arrays:")
for (key, value) in myDictionary {
    print("Key: \(key), Value: \(value)")
}

Output

Dictionary from array of arrays:
Key: 1, Value: 10
Key: 2, Value: 20
Key: 3, Value: 30

Summary

In this tutorial, we learned How to Convert an Array of Key-Value Pairs to a Dictionary in Swift language with well detailed examples.

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How to Convert an Array of Key-Value Pairs to a Dictionary in Swift - Step by Step Examples