Mutable list of data in Kotlin

Question

Please how can I perform addition function with a mutable list of type Double in kotlin? I have a mutable list of numbers I get from Firebase
How can I write a function to Find the mathematical sum of the numbers in the list (Kotlin)?

Answer 1

you can reduce function to calculate the sum

val list = mutablelistOf(1,2,3,4)

val sum = list.reduce{ a,b ->
 return a + b
}