Here is some sorting example in KOTLIN.
Sorting Array using ArrayOf
----------
fun sortedArrayOf() {
val array1 = arrayOf(44,6,1,9,23,11,5,19,3)
array1.sort()
println("Sorted array : ${array1.contentToString()}")
}
//output
/*
Sorted array : [1, 3, 5, 6, 9, 11, 19, 23, 44]
*/IntArray Sorting
----------
fun sortingByIntArray() {
val intArray = intArrayOf(4, 3, 2, 1)
intArray.sort()
println(intArray.joinToString())
// output : 1, 2, 3, 4
}
Sorting Alphabetically String Array
---------
fun sortingByAlphabetically() {
val stringArray = mutableListOf("ccc", "aab","aaa", "zzz", "bbb")
val tempSortedList = stringArray.sortedWith(compareBy { it }) //it.first() is for first letter only
println("Sorted by ascending: $tempSortedList")
//output: Sorted by ascending: [aaa, aab, bbb, ccc, zzz]
}
Get the first element of String Array
---------
fun getFirstDataOfList() {
val stringArray = mutableListOf("ccc", "aab","aaa", "zzz", "bbb")
val firstElement = stringArray.first()
println("First Element: $firstElement")
//output : First Element: ccc
}Sorting Date Ascending
---------
fun sortingByDates() {
val dates = mutableListOf(
Date(2020, 3, 8),
Date(2022, 8, 16),
Date(2020, 1, 30),
Date(1999, 1, 5)
)//useing sortBy
dates.sortBy { it.toString() }
dates.forEach { println(it) }
println(".........")
//using sortWith
dates.sortWith(compareBy<Date> { it.year }.thenBy { it.month }.thenBy { it.day })
dates.forEach { println(it) }
//for descending: dates.reverse()
println(".........")
//using sortedWith
val sortedDates = dates.sortedWith(compareBy<Date> { it.year }.thenBy { it.month }.thenBy { it.day })
sortedDates.forEach { println(it) }
//use for descending .reversed()
}
data class Date(val year: Int, val month: Int, val day: Int)
//output
/*
Date(year=1999, month=1, day=5)
Date(year=2020, month=1, day=30)
Date(year=2020, month=3, day=8)
Date(year=2022, month=8, day=16)
.........
Date(year=1999, month=1, day=5)
Date(year=2020, month=1, day=30)
Date(year=2020, month=3, day=8)
Date(year=2022, month=8, day=16)
.........
Date(year=1999, month=1, day=5)
Date(year=2020, month=1, day=30)
Date(year=2020, month=3, day=8)
Date(year=2022, month=8, day=16)
*/
Sorting Ascending array by adding manually
---------
fun sortByAddingManually() {
val stringList: MutableList<String> = ArrayList()
stringList.add("ccc")
stringList.add("aab")
stringList.add("aaa")
stringList.add("zzz")
stringList.add("bbb")
stringList.sortBy { it }
stringList.forEach { println(it) }
}
//output
//aaa
//aab
//bbb
//ccc
//zzz
Sorting by custom object
---------------------------
fun sortedCustomObject() {
val persons: MutableList<People> = ArrayList()
persons.add(People("ABC", 61))
persons.add(People("XZY", 30))
persons.add(People("ABB",61))
persons.add(People("XYZ",30))
persons.add(People("ABZ",61))
println(".....Sorted Overall Object.....")
persons.sortBy { it.toString() }
persons.forEach { println(it) }
println(".....Sorted First Name and then Age.....")
val sortedListName = persons.sortedWith(compareBy({ it.name }, { it.age }))
sortedListName.forEach { println(it) }
println(".....Sorted First Age and then Name.....")
val sortedListAge = persons.sortedWith(compareBy({ it.age }, { it.name }))
sortedListAge.forEach { println(it) }
println(".....Sorted First Age and then Name...thenBy....")
persons.sortedWith(compareBy<People> { it.name }.thenBy { it.age })
persons.forEach { println(it) }
println(".....using lambda...")
persons.sortBy { person -> person.age}
persons.forEach { println(it) }
}
data class People(val name:String, val age: Int)
//output
/*
.....Sorted Overall Object.....
People(name=ABB, age=61)
People(name=ABC, age=61)
People(name=ABZ, age=60)
People(name=XYZ, age=30)
People(name=XZY, age=30)
.....Sorted First Name and then Age.....
People(name=ABB, age=61)
People(name=ABC, age=61)
People(name=ABZ, age=60)
People(name=XYZ, age=30)
People(name=XZY, age=30)
.....Sorted First Age and then Name.....
People(name=XYZ, age=30)
People(name=XZY, age=30)
People(name=ABZ, age=60)
People(name=ABB, age=61)
People(name=ABC, age=61)
*/
More details:
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/sorted.html
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