Product of a List or Array in Kotlin

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I'm trying to find a way to get the product of a List or Array without using "repeat" or any loop on Kotlin but after some research I couldn't find anything similar.

Something like this in Python would be:

>>> reduce(lambda x, y: x*y, [1,2,3,4,5,6])
output: 720

You can use reduce in Kotlin.

From the doc:

Accumulates value starting with the first element and applying operation from left to right to current accumulator value and each element.

val list = listOf<Int>(1, 2, 3, 4, 5, 6)

val array = intArrayOf(1, 2, 3, 4, 5, 6)

list.reduce { acc, i ->  acc * i }  // returns 720

array.reduce { acc, i -> acc * i }  // returns 720

Collections, Arrays in Kotlin have a constant length, so one normally uses lists, which are Please note that this is not a part of Khan Academy's official product offering. To convert the list to an array, first we created a string array named array with size equals to list.size(). Then, we simply used list's toArray() method to convert the list items to array items. Example 2: Convert Array to list


Use the fold function

val total = listOf(1, 2, 3, 4, 5).fold(1, { total, next -> total * next })

Collections Overview, As you see, in some aspects lists are very similar to arrays. However, there is one important difference: an array's size is defined upon initialization and is never  package com.bezkoder.kotlin.sum data class Product(val name: String, val quantity: Int, val price: Double) { } Then we initialize List<Product> and we need to use map() to get the List of quantity objects before applying sum() on the result.


Hope this helps:

fun main(args: Array<String>){
   val array = intArrayOf(1, 2, 3, 4, 5, 6)
   val product = array.fold(1){acc, i -> acc * i}
   println("The result is: $product")
}

This will output the product of the array.

Kotlin arrays tutorial - working with arrays in Kotlin, Kotlin arrays tutorial shows how to work with arrays in Kotlin. An array is a collection of a fixed number of values. The array items are called The product is the accumulator, the next is the next value in the array. 5040. List is the most popular type of built-in collection in Kotlin. Index access to the elements of lists provides a powerful set of operations for lists. Index access to the elements of lists provides a powerful set of operations for lists.


An even simpler solution might be: (1..6).reduce(Int::times)

Sum and product of an array, Kotlin[edit]. // version 1.1.2 fun main(args: Array<String>) { val a = intArrayOf(1, 5, 8, 11, 15) println("Array contains : ${a.contentToString()}") Returns an empty new ArrayList. Returns a new ArrayList with the given elements.


Kotlin - average() function with Kotlin Array & List examples, kotlin-average-function-kotlin-array-list-examples-feature- val productList = listOf(Product("Samsung Galaxy S8 64GB Unlocked Phone",  Like ndarray in NumPy, it is a homogeneous multidimensional array. KtNDArray holds a pointer to its corresponding ndarray. Using the pointer, we can perform operations on the array. KtNDArray and ndarray operate on shared memory. Python allocates memory for the array, and through java.nio.DirectByteBuffer, we get access to this memory.


Kotlin Collections: Getting Started, There are different ways of creating an array in Kotlin: data class Product( val id​: Int, val name: String, val price: Double ) class Receipt( val id:  Return in Anonymous function in kotlin. If you do not want to use lambda expression, you can replace it with anonymous function. In anonymous function, you do not need labeled return.


Kotlin sum(), sumBy(), sumByDouble() and BigDecimal in List, Map , package com.bezkoder.kotlin.sum fun main(args: Array<String>) { val products = listOf( Product("A", 10, 6.90), Product("B", 20, 3.45),  In Kotlin, the default implementation of List is ArrayList which you can think of as a resizable array. Set. Set<T> stores unique elements; their order is generally undefined. null elements are unique as well: a Set can contain only one null. Two sets are equal if they have the same size, and for each element of a set there is an equal element in the other set.