Kotlin Tutorial
Kotlin Elvis Operator (Full Guide With Examples)
Table of Contents
- Introduction
- What is Elvis Operator in Kotlin?
- Kotlin Elvis Operator Syntax
- How Does Kotlin Elvis Operator Work?
- Kotlin Elvis Operator Example
- Kotlin Program Without Using Elvis Operator
- Kotlin Program Using the Elvis Operator
- Kotlin Elvis Operator Block
- Kotlin Elvis Operator with Multiple Lines
- Kotlin Elvis Operator Associativity
- Kotlin Elvis Operator With Let
- Kotlin Elvis Operator Not Working
- Kotlin Elvis Operator With Condition
Kotlin Elvis Operator FAQs
Kotlin is a concise programming language used for Android app development by developers. JetBrains introduced this open-source language.
A null value refers to when the memory location assigned to any reference value is empty, and all the bits are 0.
Kotlin is the top choice of developers for Android app development and is also used as an alternative to Java, which has been used extensively by programmers over the years.
Kotlin is an expressive and concise programming language mostly used by developers for Android app development.
The operator is called the "Elvis operator" due to its resemblance to the hairstyle of the famous singer Elvis Presley. The symbol ?: somewhat looks like Elvis Presley's iconic sideburns.
The Elvis operator is useful when dealing with nullable values to either provide a default value or execute an action when a value is null. It simplifies null checks and makes code more concise and readable.
If the left-hand side of the operator is not null, it returns that value. If the left-hand side is null, it returns the right-hand side (default) value
Yes, you can chain Elvis operators to handle multiple nullable values. The operator will return the first non-null value encountered from left to right
Common use cases include providing default values for nullable variables, executing actions when variables are null (such as logging or initialization), and simplifying conditional expressions.
Yes, the Elvis operator can be used with any data type, including custom classes and primitive types.
Yes, you can use the Elvis operator with functions that return nullable values. It's a handy way to handle the possibility of null results from functions.
Yes, the Elvis operator is similar to the null coalescing operator found in languages like C#, JavaScript, and others. It serves the same purpose of providing a default value when a variable is null.
While the Elvis operator is a common choice, you can also use safe calls and the let function to handle nullable values. The choice depends on your specific use case and coding style preferences.
Yes, the Elvis operator can be used with complex expressions on both the left and right sides. This allows you to create versatile and concise code for handling null values.
