Swift Tutorials

How to Remove Duplicates in an Array in Swift

◀ Previous Next ▶

How to Remove Duplicates in an Array in Swift ?

Answer

To remove duplicates from an array in Swift, you can use the `Set` type or a loop with a `contains` check.

✐ Examples

1 Remove Duplicates using Set

In this example,

We create an array named `numbers` with duplicate integers.
We convert the array to a Set to automatically remove duplicates.
Finally, we convert the Set back to an array to get the array without duplicates. When print to the output, the order of elements may change from the order shown in the output.

Swift Program

let numbers = [1, 2, 2, 3, 4, 4, 5]
let uniqueNumbers = Array(Set(numbers))
print("Array without duplicates:", uniqueNumbers)

Output

Array without duplicates: [5, 2, 3, 1, 4]

2 Remove Duplicates using Loop

In this example,

We create an array named `colors` with duplicate strings.
We use a loop to check and filter out duplicate elements.
Finally, we get an array without duplicates using the loop method. When print to the output, the order of elements may change from the order shown in the output.

Swift Program

let colors = ["red", "green", "blue", "green", "yellow", "blue"]
var uniqueColors = [String]()
for color in colors {
    if !uniqueColors.contains(color) {
        uniqueColors.append(color)
    }
}
print("Array without duplicates:", uniqueColors)

Output

Array without duplicates: ["red", "green", "blue", "yellow"]

Summary

In this tutorial, we learned How to Remove Duplicates in an Array in Swift language with well detailed examples.

◀ Previous Next ▶

Swift Tutorials

Swift How-Tos

How to Remove Duplicates in an Array in Swift

How to Remove Duplicates in an Array in Swift ?

Answer

✐ Examples

1 Remove Duplicates using Set

Swift Program

Output

2 Remove Duplicates using Loop

Swift Program

Output

Summary

More Swift Arrays Tutorials