How to Remove String From A Listof Strings In Kotlin?

8 minutes read

To remove a specific string from a list of strings in Kotlin, you can use the filter() method along with the notEquals operator to create a new list that does not contain the desired string. Here's an example code snippet:


val listOfStrings = listOf("apple", "banana", "orange", "grape") val stringToRemove = "orange"


val filteredList = listOfStrings.filter { it != stringToRemove }


This will create a new list called filteredList that excludes the string "orange" from the original listOfStrings.

Best Kotlin Books to Read in 2024

1
Atomic Kotlin

Rating is 5 out of 5

Atomic Kotlin

2
Kotlin in Action

Rating is 4.9 out of 5

Kotlin in Action

3
Java to Kotlin: A Refactoring Guidebook

Rating is 4.8 out of 5

Java to Kotlin: A Refactoring Guidebook

4
Programming Kotlin: Create Elegant, Expressive, and Performant JVM and Android Applications

Rating is 4.7 out of 5

Programming Kotlin: Create Elegant, Expressive, and Performant JVM and Android Applications

5
Modern Android 13 Development Cookbook: Over 70 recipes to solve Android development issues and create better apps with Kotlin and Jetpack Compose

Rating is 4.6 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

6
Kotlin Cookbook: A Problem-Focused Approach

Rating is 4.5 out of 5

Kotlin Cookbook: A Problem-Focused Approach

7
Programming Android with Kotlin: Achieving Structured Concurrency with Coroutines

Rating is 4.4 out of 5

Programming Android with Kotlin: Achieving Structured Concurrency with Coroutines

8
Kotlin and Android Development featuring Jetpack: Build Better, Safer Android Apps

Rating is 4.3 out of 5

Kotlin and Android Development featuring Jetpack: Build Better, Safer Android Apps


How to remove strings that match a regex pattern in kotlin?

You can use the replace function with a regex pattern in Kotlin to remove strings that match the pattern. Here is an example of how you can achieve this:

1
2
3
4
5
6
val input = "Hello123 World456"
val pattern = "\\d+".toRegex() // this pattern will match any sequence of digits

val result = input.replace(pattern, "") // replace all matches of the pattern with an empty string

println(result) // Output: Hello World


In this example, the replace function is used to remove all sequences of digits from the input string by replacing them with an empty string. You can adjust the regex pattern to match any specific pattern you want to remove from the input string.


How to use filter function to remove strings from a list in kotlin?

You can use the filter function in Kotlin to remove strings from a list based on a specified condition. Here is an example of how you can use the filter function to remove strings from a list:

1
2
3
4
5
6
7
8
9
fun main() {
    val list = listOf("apple", "banana", 1, "orange", 2, "grape")

    val filteredList = list.filter {
        it !is String
    }

    println(filteredList)
}


In this example, the filter function is used to create a new list called filteredList that contains only elements that are not strings. The condition it !is String checks if the element is not a string, and if it is not a string, it is included in the filtered list.


When you run this code, the output will be:

1
[1, 2]


This shows that the strings "apple", "banana", "orange", and "grape" have been removed from the original list.


How to remove strings from a list in kotlin?

You can remove strings from a list in Kotlin using the removeAll() function. Here's an example:

1
2
3
4
5
6
7
8
fun main() {
    val list = mutableListOf("Apple", "Banana", "Orange", "Apple", "Grapes")
    val stringsToRemove = listOf("Apple", "Orange")

    list.removeAll(stringsToRemove)

    println(list)  // Output: [Banana, Grapes]
}


In this example, we have a list of fruits and we want to remove the strings "Apple" and "Orange" from the list. We use the removeAll() function and pass in a list of strings to be removed. This will remove all occurrences of the specified strings from the original list.


What is the best way to remove whitespace from strings in a list in kotlin?

One way to remove whitespace from strings in a list in Kotlin is to use the map function along with the trim() function.


Here's an example code snippet:

1
2
3
4
5
6
7
fun main() {
    val list = listOf("  hello ", "  kotlin   ", "   is   awesome  ")

    val trimmedList = list.map { it.trim() }

    trimmedList.forEach { println(it) }
}


In this example, the map function is used to apply the trim() function to each element in the list, removing leading and trailing whitespace from each string. The resulting trimmedList contains the strings with whitespace removed.


Output:

1
2
3
hello
kotlin
is   awesome


Facebook Twitter LinkedIn Telegram Whatsapp Pocket

Related Posts:

In Kotlin, you can create a list of objects using various methods. Here are a few ways to achieve this:Using the listOf() function: You can create a read-only list using the listOf() function. It takes any number of arguments and returns an immutable list cont...
The main difference between a four-string and a five-string bass guitar is the number of strings they have. A four-string bass typically has thicker strings and is tuned E-A-D-G from lowest to highest pitch. On the other hand, a five-string bass has an additio...
Working with collections in Kotlin involves manipulating and performing various operations on data structures that store multiple values. Kotlin provides a wide range of collection types, including lists, sets, and maps, each designed to serve different purpos...