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How to get the union of a set and an array in Swift

Theodore Kelechukwu Onyejiaku

Overview

A union is a set that contains values or elements present in the sets we are comparing. We can use the union() method to get the union between a set and an array.

Differences between a set and an array

A set contains unique elements, whereas an array may or may not contain unique elements.

Syntax

set.union(sequence)
Get the union between a set and an array in Swift

Parameter

We specify a sequence that could either be an array or a set. The union between the set and this sequence is taken.

Return value

It returns a new Set, which contains the elements of the union of Set and sequence.

Example

// create some sets
let evenNumbers : Set = [2, 4, 6, 8, 10]
let oddNumbers : Set = [3, 5, 7, 9, 11]
let alphabets : Set = ["a", "x", "s", "w", "j"]

// create some arrays
let numbers = [1, 100, 30, 3]
let letters = ["a", "b", "c", "d"]

// get and print the uions
print(evenNumbers.union(numbers).sorted())
print(oddNumbers.union(numbers).sorted())
print(alphabets.union(letters).sorted())
Get the union of a set and an array in Swift

Explanation

  • Lines 3–5: We declare three Set instances and initialize them.

  • Line 8–9: We declare two arrays, numbers and letters.

  • Lines 12–14: We use the union() method to get the unions between the sets and arrays and sort the resulting union. Next, we print the results to the console.

RELATED TAGS

set
range
union
swift
communitycreator

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Theodore Kelechukwu Onyejiaku
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