How to Merge Two Arrays in Swift?

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In Swift, there are several ways to merge two arrays. One way is to use the + operator to concatenate the two arrays. This method creates a new array that contains the elements from both of the original arrays.

let firstArray = [1, 2, 3]
let secondArray = [4, 5, 6]

let mergedArray = firstArray + secondArray
print(mergedArray) // [1, 2, 3, 4, 5, 6]

Another way to merge two arrays is to use the append(contentsOf:) method. This method appends the elements of one array to the end of another array.

var firstArray = [1, 2, 3]
let secondArray = [4, 5, 6]

firstArray.append(contentsOf: secondArray)
print(firstArray) // [1, 2, 3, 4, 5, 6]

You can also use the insert(contentsOf:at:) method to insert the elements of one array into another array at a specific index.

var firstArray = [1, 2, 3]
let secondArray = [4, 5, 6]

firstArray.insert(contentsOf: secondArray, at: firstArray.endIndex)
print(firstArray) // [1, 2, 3, 4, 5, 6]

You can also use the reduce method to merge two arrays. Read also The Power of reduce in Swift

let firstArray = [1, 2, 3]
let secondArray = [4, 5, 6]

let mergedArray = firstArray.reduce(secondArray) { $0 + [$1] }
print(mergedArray) // [4, 5, 6, 1, 2, 3]

All of these methods will merge two arrays in Swift, but the best method to use will depend on the specific requirements of your application. Each of these methods have their own advantages and limitations. Be sure to test your code thoroughly when using any of these methods to ensure that it behaves as expected.

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