How to Filter Elements of an Array based on a Condition in Kotlin - Step by Step Examples

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How to Filter Elements of an Array based on a Condition in Kotlin ?

Answer

To filter elements of an array based on a condition in Kotlin, you can use the filter method.

✐ Examples

1 Filter Even Numbers from an Array of Integers

In this example,

We create an array of integers named intArray with various integer values.
We use the filter method on intArray to select only the even numbers. The filter method takes a lambda function that specifies the condition for filtering, in this case, checking if the number is even using the modulus operator %.
The result of the filter method is a list of integers that meet the condition, which we convert to an array using the toTypedArray method.
Finally, we print the filtered array to standard output.

Kotlin Program

fun main(args: Array<String>) {
    val intArray = arrayOf(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
    val evenArray = intArray.filter { it % 2 == 0 }.toTypedArray()
    println("Filtered array: ${evenArray.joinToString()}")
}

Output

Filtered array: 2, 4, 6, 8, 10

2 Filter Strings Longer Than 3 Characters from an Array of Strings

In this example,

We create an array of strings named stringArray with various string values.
We use the filter method on stringArray to select only the strings that are longer than 3 characters. The filter method takes a lambda function that specifies the condition for filtering, in this case, checking if the length of the string is greater than 3 using the length property.
The result of the filter method is a list of strings that meet the condition, which we convert to an array using the toTypedArray method.
Finally, we print the filtered array to standard output.

Kotlin Program

fun main(args: Array<String>) {
    val stringArray = arrayOf("a", "ab", "abc", "abcd", "abcde")
    val filteredArray = stringArray.filter { it.length > 3 }.toTypedArray()
    println("Filtered array: ${filteredArray.joinToString()}")
}

Output

Filtered array: abcd, abcde

Summary

In this tutorial, we learned How to Filter Elements of an Array based on a Condition in Kotlin language with well detailed examples.

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How to Filter Elements of an Array based on a Condition in Kotlin - Step by Step Examples

How to Filter Elements of an Array based on a Condition in Kotlin ?

Answer

✐ Examples

1 Filter Even Numbers from an Array of Integers

Kotlin Program

Output

2 Filter Strings Longer Than 3 Characters from an Array of Strings

Kotlin Program

Output

Summary

More Kotlin Arrays Tutorials