Swift .isSubset()

The .isSubset() method returns true if all elements of a set are present in another set (passed as an argument), false otherwise.

Syntax

setName.isSubset(of: otherSetName)

The isSubset() method returns true if setName is a subset of otherSetName, false otherwise.

Example

let set1: Set = [2, 4, 6, 8, 10]
let set2: Set = [4, 10]

if set2.isSubset(of: set1) {
  print("set2 is a subset of set1.")
} else {
  print("set2 is not a subset of set1.")
}

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In the example above, the first block after the if statement will run if set2 is a subset of set1. This will output:

set2 is a subset of set1.

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