How to Use Sortby In Kotlin?

To use sortBy in Kotlin, you can call the sortBy extension function on a collection. This function takes a lambda parameter that defines the sorting criteria. The sortBy function returns a new list that is sorted based on the criteria defined in the lambda. Keep in mind that the original collection remains unchanged.

Best Kotlin Books to Read in 2024

1

Rating is 5 out of 5

Atomic Kotlin

Get Book Now

2

Rating is 4.9 out of 5

Head First Android Development: A Learner's Guide to Building Android Apps with Kotlin

Get Book Now

3

Rating is 4.8 out of 5

Kotlin Programming: The Big Nerd Ranch Guide (Big Nerd Ranch Guides)

Get Book Now

4

Rating is 4.7 out of 5

Kotlin in Action

Get Book Now

5

Rating is 4.6 out of 5

Kotlin Design Patterns and Best Practices: Build scalable applications using traditional, reactive, and concurrent design patterns in Kotlin, 2nd Edition

Get Book Now

6

Rating is 4.5 out of 5

Head First Kotlin: A Brain-Friendly Guide

Get Book Now

7

Rating is 4.4 out of 5

Kotlin Cookbook: A Problem-Focused Approach

Get Book Now

8

Rating is 4.3 out of 5

How to Build Android Apps with Kotlin: A practical guide to developing, testing, and publishing your first Android apps, 2nd Edition

Get Book Now

9

Rating is 4.2 out of 5

Modern Android 13 Development Cookbook: Over 70 recipes to solve Android development issues and create better apps with Kotlin and Jetpack Compose

Get Book Now

10

Rating is 4.1 out of 5

Java to Kotlin: A Refactoring Guidebook

Get Book Now

How to use sortby in Kotlin to organize a list of numbers?

To use the sortBy function in Kotlin to organize a list of numbers, follow these steps:

1. Create a list of numbers:

1

val numbers = listOf(5, 3, 8, 2, 9, 1)

1. Use the sortBy function to sort the list of numbers in ascending order:

1

val sortedNumbers = numbers.sortedBy { it }

1. Print the sorted list of numbers:

1

println(sortedNumbers)

The output will be [1, 2, 3, 5, 8, 9], which is the sorted list of numbers in ascending order.

You can also use sortByDescending function to sort the list of numbers in descending order:

1
2

val sortedNumbersDescending = numbers.sortedByDescending { it }
println(sortedNumbersDescending)

The output will be [9, 8, 5, 3, 2, 1], which is the sorted list of numbers in descending order.

How to use sortby in Kotlin to sort a list of characters in reverse alphabetical order?

To sort a list of characters in reverse alphabetical order in Kotlin, you can make use of the sortedBy function along with the compareByDescending function. Here's an example of how you can achieve this:

1
2
3
4
5
6
7

fun main() {
    val charList = listOf('d', 'a', 'c', 'b')
    
    val sortedList = charList.sortedByDescending { it }
    
    println(sortedList)
}

In this example, we have a list of characters charList containing the characters 'd', 'a', 'c', and 'b'. We then use the sortedByDescending function to sort the list in descending order, which results in the characters being sorted in reverse alphabetical order.

When you run this code, the output will be:

1

[d, c, b, a]

How to use sortby in Kotlin to order a list of dates from latest to earliest?

To use the sortedBy function in Kotlin to order a list of dates from latest to earliest, you can follow these steps:

1. Create a list of dates:

1
2
3
4
5
6

val dates = listOf(
    "2021-10-15",
    "2021-10-12",
    "2021-10-20",
    "2021-10-05"
)

1. Convert the list of date strings to LocalDate objects:

1

val sortedDates = dates.map { LocalDate.parse(it) }

1. Use the sortedByDescending function to sort the list of LocalDate objects from latest to earliest:

1

val sortedDatesDescending = sortedDates.sortedByDescending { it }

1. Print the sorted list of dates:

1
2
3

sortedDatesDescending.forEach {
    println(it)
}

By following these steps, you will have a list of dates sorted from latest to earliest using the sortedByDescending function in Kotlin.