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Introduction to Kotlin List

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Syntax

The kotlin language has default classes, methods, and variables to implement the application with more sophisticated. Like that list is one of the collection interfaces and it is used to store and retrieve the data from backend to the front end.

{ var lst=listOf(values) loops iteration —some logic codes depends on the requirement— }

The above code is the basic syntax and the listOf() method is used to store the elements in the database with the sequence order.

How does the list work in Kotlin? Examples of Kotlin List

Here are the following examples mentioned below:

Example #1

Code:

interface first { fun methd1() { println("Thank you for declaring the first interface with the method to write the list interface logic codes") } } interface second { fun methd2() { println("Its the second interface for declaring the method and this features for to write and call the kotlin list interface codea") } } const val vars1 = "Have a Nice day users please try again" val vars2 = methd3() fun methd3(): String { return "Your return value is:" } class Sample: first, second fun main() { val a = listOf('J', 'F', 'M', 'A','M','J','J','A','S','O','N','D') println(a.size) println(a.indexOf('2')) println(a[2]) val x = listOf("January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December") println("Your String arraylist data size is: "+x.size) println("Please find the index of the july string is : "+x.indexOf("July")) println("Output value of the x[6]th index is"+x[6]) for(j in x.indices){ println(x[j]) } val num = listOf("Tv first electricala appliance","Fridge is the second one","Washing machine is third one", "Fridge is fourth one", "Laptop is fifth one", "PC is sixth one", "Microwave oven is seventh one", "Ups-Inverter is eigth one", "Mobile is electronic device","Fan is tenth one") val num1 = num.get(5) println(num1) val num2 = num[6] println(num2) val index1 = num.indexOf("Washing machine") println("The first index of number is $index1") val index3 = num.lastIndex println("The last index of the list is $index3") val ob = Sample() ob.methd1() ob.methd2() println("The kotlin codes which used to declare the variable values using $vars1") println("Value of the string type: $vars2") var z = 400 println("The value of a is = $z"); var b = "The string inputs" println("The value of b is = $b") var c = 0x0C println("The value of c is = $c") var d = 0b10 println("The value of d is = $d") var e = 122_222_333_444 println("The value of e is= $e"); var f = 2340_320000L println("The value of f is = $f") var g = 0x0C_0c_0f println("The value of g is = $g") var h = 0b10_1000_10 println("The value of h is = $h") }

Output:

In the above example, we used to perform the list operations using the built-in methods.

Example #2

Code:

{ val HomeAppliances = listOf(“Bed”, “Pillows”, “Cort”, “Locker”, “Travel Bag”, “Wall watch”, “Cleaning equipments”) for (ha in HomeAppliances) { print(“$ha, “) } println() for (i in 0 until HomeAppliances.size) { print(“${HomeAppliances[i]} “) } println() while (it.hasNext()) { val i = it.next() print(“$i “) } println() }

Output:

The second example we used to store the home appliances using the listOf() method.

Example #3

{ val numberlist = listOf(11, 22, 33, 44, 55, 66, 77, 88, 99,110 ) val ascendingorder = numberlist.sorted() println(ascendingorder) val descendingorder = numberlist.sortedDescending() println(descendingorder) val numberlists = listOf(77, 44, 22, 11, 33, 55, 66, 88, 99,110 ) val output = numberlists.contains(2) if (output) println(“The numberlist contains 2”) else println(“The numberlist does not contain 2”) val results = numberlists.containsAll(listOf(4, -3)) if (results) println(“The numberlist contains 5 and -2”) else println(“The numberlist does not contain 5 and -2”) }

Output:

In the final example, we used listOf() methods in the list interface which is used to perform the sorting operations in the task.

Conclusion

In kotlin language, we used a lot of util package concepts like list, map,..etc. These interfaces and classes are used to perform the data operations in the application by using the default classes and methods to start the user-defined tasks. It is supported and depreciated the older methods when we used and call the same in the main function.