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Introduction to Kotlin Filter

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Syntax

In kotlin language, the supertype for all the types of the object is the root and parent class it is more similar to the java language. Like that filter() is one of the kotlin pre-defined methods it can be filtered with the normal predicate and it returns with some matched collection elements.

fun main() { val vars1 : collections like map() ---some kotlin logics depends upon the requirement--- }

The above codes are the basic syntax for utilizing the filter() method on the default packages like collections and other util packages.

How does the filter function work in Kotlin?

The kotlin filter function is used to create the separate list as a new list based upon the predicated data. While we filtering the user data the results which called on by using the function that allows us to accumulate the outputs of the filter’s datas with different arrays. So that we have taken the help of filterTo() method for the mutable list copy datas for the mutable arrays which is already declared and initialized to the memory. When we use the filter option it allows us to take several collections and combined to form the filter with the single and accumulative collection data.

While filtering data the function also allows us to accumulate the output results of the filters with different arrays. It filters them into the single and accumulative collection data if the array contains the null elements the beneficial pair of the filter methods is in two methods like filterNotNull and filterNotNullTo which just want to filter out the null elements in the list stack. The predicated also follows up the lambda expressions that can be combined with both the elements and its index position. Because the filter function represents the predicate that goes to be the boolean-valued format for the parameters.

Examples of Kotlin Filter

Examples of Kotlin Filter are given below:

Example #1

Code:

package one; { val news = listOf("Welcome","To","My","Domain","Have", "a", "nice", "day users please try and use our application") val eg=listOf("Today is Sunday","Today is Monday", "Today is Tuesday", "Today is Wednesday", "Today is Thursday", "Today is Friday", "Today is Saturday") println("Thank you users your input string length is $news1") val news2 = mapOf("key1" to 11, "key2" to 21, "key3" to 31, "key4" to 41, "key5" to 51, "key6" to 61, "key7" to 71, "key8" to 81, "key9" to 91, "key10" to 101 ) println("Thank you users after filtering your input string the result is $news3") println(news4) val news5 = mapOf("key11" to 12, "key12" to 22, "key13" to 32, "key14" to 42, "key15" to 52, "key16" to 62, "key17" to 72, "key18" to 82, "key19" to 92, "key20" to 102 ) println(news5) }

Output:

In the above example, we can filter the string values in the list and print it on the console.

Example #2

Code:

package one; data class first(val ex1: String, val ex2: Int, val ex3: Int) if(vars3 == 2) return null return eg[vars3] } { println("Welcome To My Domain have a nice day users please keep on spenting time with our application") val eg1 = listOf(11,22,33,44,55,66,77,88,99,54, 12,22,33) val eg2 = listOf(44,66,88,10,12) val eg3 = eg1.filter { eg2.contains(it) } print(eg3) val results = listOf( first("Thank you users this is January month", 31, 0), first("Thank you users this is February month", 28, 1), first("Thank you users this is March month", 31, 2), first("Thank you users this is April month", 30, 3), first("Thank you users this is May month", 31, 4), first("Thank you users this is June month", 30, 5), first("Thank you users this is July month",31, 6), first("Thank you users this is August month",30, 7), first("Thank you users this is September month",31, 8), first("Thank you users this is October month",31, 9), first("Thank you users this is November month",30, 10), first("Thank you users this is December month",31, 11) ) val demo1 = results.indexOfFirst { chúng tôi == "Thank you users this is April month" && chúng tôi == 30 } val demo2 = results.indexOfFirst { chúng tôi == "Thank you users this is May month" && chúng tôi == 31 } val demo3 = results.indexOfFirst { chúng tôi == "Thank you users this is August month" && chúng tôi == 31 } println(demo(results,demo1)) println(demo(results,demo2)) println(demo(results,demo3)) println("Thank you users for spending the time with our application") }

Output:

Example #3

Code:

package one; { println("Welcome To My Domain have a nice day users please keep on spending time with our application") val str1 = "Have a Nice Day users" println("Thank you users your Filtered String is : " + result) val str2 = "Please try again" println("Thank you users your Filtered String is : " + result2) println("Thank you users for spending the time with our application") val str3 = "Thank you for 432spenting the time" println("Thank you users your Filtered String is : " + result3) }

Output:

In the final example, we can filter and calculate the upper characters in the string variable using the filter() method.

Conclusion

In conclusion, part kotlin filter is one of the collection methods and its values are iterated and validate the conditions using the statements. Here we can sort out the user input conditions based on that the values are fetched out on the memory list. Before that it checks the filter condition and then it validates and processed it on the backend nodes.