How to number numbers in the list in Kotlin
To number the numbers in a list in Kotlin, you can follow these steps:
- Create a list of numbers: First, create a list of numbers that you want to number. For example, you can create a list of integers like this:
kotlin
val numbers = listOf(10, 20, 30, 40, 50)
- Initialize a variable to keep track of the index: Declare a variable to keep track of the current index while iterating over the list. You can initialize it to 1 since we want to start numbering from 1.
kotlin
var index = 1
- Use the
map
function to transform the list: Themap
function allows you to transform each element in the list. Iterate over the list using themap
function and transform each element by appending the index to it.
kotlin
val numberedNumbers = numbers.map { number ->
val numberedNumber = "$index. $number"
index++
numberedNumber
}
In the above code, we use the lambda expression { number -> ... }
to specify the transformation for each element. Inside the lambda, we create a new variable numberedNumber
by appending the index and the original number. After that, we increment the index.
- Print the numbered list: Finally, you can print the numbered list to see the result.
kotlin
numberedNumbers.forEach { println(it) }
The forEach
function iterates over each element in the numberedNumbers
list and prints it.
When you run the above code, you will see the list of numbers with their corresponding numbers:
1. 10
2. 20
3. 30
4. 40
5. 50
This approach allows you to number the numbers in a list while explaining each step.