Kotlin take method explanation with different examples

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kotlin take() method example

Kotlin take() method :

take() method is defined in Kotlin standard library. This method can be used with an array or iterable. In this tutorial, we will learn how to use take method in kotlin with example. The program will show you how take works on arrays with a different data type.

 

take() method :

The take() method is defined under kotlin.collections of Kotlin standard library.

fun  Array.take(n: Int): List
fun ByteArray.take(n: Int): List
fun ShortArray.take(n: Int): List
fun IntArray.take(n: Int): List
fun LongArray.take(n: Int): List
fun FloatArray.take(n: Int): List
fun DoubleArray.take(n: Int): List
fun BooleanArray.take(n: Int): List
fun CharArray.take(n: Int): List
fun  Iterable.take(n: Int): List

As you can see that we can use take() method with array or with iterables. We will check how it works with different examples below.

It takes one integer n as parameter and returns a list.

 

Example of take method with arrays :

import java.util.*

fun main(args: Array) {
    val intArray = intArrayOf(1, 2, 3, 4, 5)
    val charArray = charArrayOf('a', 'b', 'c', 'd', 'e')
    val floatArray = floatArrayOf(1.0f, 2.0f, 3.0f)

    println("First 3 values of ${Arrays.toString(intArray)} are ${intArray.take(3)}")
    println("First 2 values of ${Arrays.toString(charArray)} are ${charArray.take(2)}")
    println("First 5 values of ${java.util.Arrays.toString(floatArray)} are ${floatArray.take(5)}")
}

kotlin take with array

If you run this program, it will print the below output :

First 3 values of [1, 2, 3, 4, 5] are [1, 2, 3]
First 2 values of [a, b, c, d, e] are [a, b]
First 5 values of [1.0, 2.0, 3.0] are [1.0, 2.0, 3.0]
  1. In this example, we have tried take() method with three different arrays.
  2. The return value is a list containing the first n elements of each array, where n is the argument.
  3. The last array has 3 elements, but we are passing 5 as the argument. So it returned a list containing all elements of the array.

 

Example with Iterable :

Let’s try to implement the above program with a list and set :

fun main(args: Array) {
    val list = listOf(1,2,3,4,5)
    val set = setOf(1,2,2,4,5,6)

    println("First 3 values of $list are ${list.take(3)}")
    println("First 7 values of $set are ${set.take(7)}")
}

kotlin take with iterable

It will print :

First 3 values of [1, 2, 3, 4, 5] are [1, 2, 3]
First 7 values of [1, 2, 4, 5, 6] are [1, 2, 4, 5, 6]

So, the same rule is applied with list and set. The first variable is a list and the second is a set.

The above examples are available on Github

Categories: kotlin

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