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How to get the hash value for a set in Swift

Theodore Kelechukwu Onyejiaku

Overview

A hash is an integer value that is unique and used to represent other values such as a set, integer, arrays, strings, etc. In the Set collection, two equal sets can have the same hash value. In order to get the hash value of a Set class, we use the hashValue property.

Note: Hash values are different for every execution.

Syntax

set.hashValue
Syntax for getting the hash value of a Set collection in Swift

Return value

The value returned is a hash value, which is an integer.

Code example

// create some sets
let evenNumbers1 : Set = [10, 2, 6, 8, 4]
let evenNumbers2 : Set = [10, 2, 6, 8, 4]
let oddNumbers : Set = [11, 5, 7, 3, 9]
let first_names : Set = ["john", "jane", "henry", "mark"]

// get the hash values
print(evenNumbers1.hashValue)
print(evenNumbers2.hashValue)
print(oddNumbers.hashValue)
print(first_names.hashValue)
Get hash values for Set instances in Swift

Explanation

  • Lines 2–5: We create some instances of the Set collection and initialize them with some elements.
  • Lines 8–11: We get the hash values of the sets and print them to the console.

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swift
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Theodore Kelechukwu Onyejiaku
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