Kotlin String.hashCode()

Kotlin String.hashCode() Tutorial

The String.hashCode() function in Kotlin is used to compute the hash code of the given string.

The hash code is a numerical representation of the contents of the string and is commonly used in hash-based collections for efficient data retrieval.

In this tutorial, we’ll explore the syntax of the String.hashCode() function and provide examples of its usage in Kotlin strings.

Syntax

The syntax of the String.hashCode() function is:

fun String.hashCode(): Int

The hashCode() function takes no parameters and returns an integer representing the hash code of the string.

Examples for String hashCode() function

1. Computing Hash code of given String

Kotlin Program

fun main() {
    val myString = "Hello, Kotlin!"

    // Using hashCode() to compute the hash code
    val stringHashCode = myString.hashCode()

    // Printing the original string and its hash code
    println("Original String:\n$myString\n")
    println("Hash Code:\n$stringHashCode")
}

Output

Original String:
Hello, Kotlin!

Hash Code:
1454558906

Summary

In this tutorial, we’ve covered the String.hashCode() function in Kotlin strings, its syntax, and how to use it to compute the hash code of a string. The hash code is useful for various algorithms and data structures that rely on efficient storage and retrieval based on hash values.