CODEWITHSUNDEEP
kotlin
MARSH
MARSH

Reputation: 271

how to sort item of alphanumeric type of string using sort method in kotlin

This is my data

val data = ArrayList<Product>()
        data.add(Product(it=1,type = "Ait 45"))
        data.add(Product(it=2,type = "Ait 35"))
        data.add(Product(it=3,type = "Ait 65"))
        data.add(Product(it=4,type = "Ait 325"))
        data.add(Product(it=5,type = "Ait 42"))

I am trying sort data based on type in descending order which is string type

expected output after sort

data should = {(it=2,type = "Ait 35"),(it=5,type = "Ait 42"),(it=1,type = "Ait 45"),(it=3,type = "Ait 65"),(it=4,type = "Ait 325")}

Please help me how to sort item using sort method in kotlin

Upvotes: 0

Views: 1113

Answers (1)

Some random IT boy
Some random IT boy

Reputation: 8457

You can use List<T>.sortedBy() function from the standard library which returns a new list with the sorted elements or MutableList<T>.sortBy() which sorts the elements in-place (moves the current list's items around to sort them).

Both of these functions sortedBy and sortBy have their sortedByDescending and sortByDescending counterparts.

Note that the following code will sort the strings by text, if you want to sort by the integer value contained into the "type" string you'd need to convert that value into an integer by manipulating the string contents.

data class Product(val it: Int,val type: String)

fun main() {
    val data = ArrayList<Product>()
    data.add(Product(it=1,type = "Ait 45"))
    data.add(Product(it=2,type = "Ait 35"))
    data.add(Product(it=3,type = "Ait 65"))
    data.add(Product(it=4,type = "Ait 325"))
    data.add(Product(it=5,type = "Ait 42"))
    println(data.sortedBy { it.type})
    println(data.sortedByDescending { it.type})
}

See the code in action inside the Kotlin playground

Upvotes: 1

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