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KOTLIN - REPLACE LIST ELEMENTS

Change/Replace an Item in a List using index

Let us say, we have a List that contains three names, 'Mohan', 'Kriti' and 'Salim'. And we want to replace the name 'Kriti' with a new name 'Paul'.

Example :

fun main() {
    var x = mutableListOf("Mohan", "Kriti", "Salim")
    x[1] = "Paul"
    println(x)
}

Output :

[Mohan, Paul, Salim]

So, in the above code we have created a 'List' using 'mutableListOf()' method, because we need to replace an element in the List.

var x = mutableListOf("Mohan", "Kriti", "Salim")

Caution : Use 'mutableListOf()' method and not 'listOf()' method.

Now, let us see, how the values are positioned in the List

Now, if we see the above diagram, 'Kriti' resides at position/index '1'. So, what we do is, just replace the position/index '1' (i.e. x[1]) with the new name 'Paul'.

x[1] = "Paul"

And we get the below output,

[Mohan, Paul, Salim]

Change/Replace an Item in a List using set() method

Let us take the same example, where we have a List that contains three names, 'Mohan', 'Kriti' and 'Salim'. And we want to replace the name 'Kriti' with a new name 'Paul'.

Example :

fun main() {
    var x = mutableListOf("Mohan", "Kriti", "Salim")
    x.set(1, "Paul")
    println(x)
}

Output :

[Mohan, Paul, Salim]

So, in the above code we have created a 'List' using 'mutableListOf()' method, because we need to replace an element in the List.

var x = mutableListOf("Mohan", "Kriti", "Salim")

Caution : Use 'mutableListOf()' method and not 'listOf()' method.

Now, let us see, how the values are positioned in the List

Now, if we see the above diagram, 'Kriti' resides at position/index '1'. So, what we do is,use the 'set()' method specifying the position/index '1' and the new name 'Paul'.

x.set(1, "Paul")

And we get the below output,

[Mohan, Paul, Salim]

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