// https://www.codewars.com/kata/5a905c2157c562994900009d/train/javascript

//

// Task

// Given an array/list [] of integers , Construct a product array Of same size Such That prod[i] is equal to The Product of all the elements of Arr[] except Arr[i].

//

// Notes

// Array/list size is at least 2 .

//

// Array/list's numbers Will be only Positives

//

// Repetition of numbers in the array/list could occur.

//

// Input >> Output Examples

// productArray ({12,20}) ==> return {20,12}

// Explanation:

// The first element in prod [] array 20 is the product of all array's elements except the first element

//

// The second element 12 is the product of all array's elements except the second element .

//

// productArray ({1,5,2}) ==> return {10,2,5}

// Explanation:

// The first element 10 is the product of all array's elements except the first element 1

//

// The second element 2 is the product of all array's elements except the second element 5

//

// The Third element 5 is the product of all array's elements except the Third element 2.

//

// productArray ({10,3,5,6,2}) return ==> {180,600,360,300,900}

// Explanation:

// The first element 180 is the product of all array's elements except the first element 10

//

// The second element 600 is the product of all array's elements except the second element 3

//

// The Third element 360 is the product of all array's elements except the third element 5

//

// The Fourth element 300 is the product of all array's elements except the fourth element 6

//

// Finally ,The Fifth element 900 is the product of all array's elements except the fifth element 2

const tests = [

[[12, 20], [20, 12]],

[[3, 27, 4, 2], [216, 24, 162, 324]],

[[13, 10, 5, 2, 9], [900, 1170, 2340, 5850, 1300]],

[[16, 17, 4, 3, 5, 2], [2040, 1920, 8160, 10880, 6528, 16320]],

]

function productArray(numbers){

if (numbers.length === 2) {

const [num1, num2] = numbers;

return [num2, num1];

}

const productArr = [];

for (let i = 0; i < numbers.length; i++) {

productArr.push(numbers.reduce((acc, curr, index) => i === index ? acc*=1 : acc*=curr ,1));

}

return productArr;

}

tests.forEach((test) => console.log(`is: ${productArray(test[0])}, should be: ${test[1]}`));