Sum of distinct elements of an array - JavaScript

We are required to write a JavaScript function that takes in one such array and counts the sum of all distinct elements of the array.

For example: Suppose, we have an array of numbers like this −

const arr = [1, 5, 2, 1, 2, 3, 4, 5, 7, 8, 7, 1];

The output for the array mentioned above will be 20.

Example

Following is the code −

const arr = [1, 5, 2, 1, 2, 3, 4, 5, 7, 8, 7, 1];
const distinctSum = arr => {
   let res = 0;
   for(let i = 0; i < arr.length; i++){
      if(i === arr.lastIndexOf(arr[i])){
         res += arr[i];
      };
      continue;
   };
   return res;
};
console.log(distinctSum(arr));

Output

Following is the output in the console −

30

AmitDiwan

Published on 16-Sep-2020 09:22:18

• Related Questions & Answers
• Sum of distinct elements of an array in JavaScript
• Thrice sum of elements of array - JavaScript
• Absolute sum of array elements - JavaScript
• Sum of all the non-repeating elements of an array JavaScript
• Finding desired sum of elements in an array in JavaScript
• Pair of (adjacent) elements of an array whose sum is lowest JavaScript
• Find sum of non-repeating (distinct) elements in an arrays in C++
• Product of non-repeating (distinct) elements in an Array in C++
• Maximum sum of n consecutive elements of array in JavaScript
• Finding sum of alternative elements of the array in JavaScript
• Rearranging elements of an array in JavaScript
• Java program to find the sum of elements of an array
• Deep count of elements of an array using JavaScript
• Compute the sum of elements of an array which can be null or undefined JavaScript
• Alternating sum of elements of a two-dimensional array using JavaScript