We are required to write a JavaScript function that takes in an array of Numbers as the only argument. The function should calculate and return the sum of alternative elements of the array.
For example −
If the input array is −
const arr = [1, 2, 3, 4, 5, 6, 7];
Then the output should be −
1 + 3 + 5 + 7 = 16
Example
Following is the code −
const arr = [1, 2, 3, 4, 5, 6, 7]; const alternativeSum = (arr = []) => { let sum = 0; for(let i = 0; i < arr.length; i++){ const el = arr[i]; if(i % 2 !== 0){ continue; }; sum += el; }; return sum; }; console.log(alternativeSum(arr));
Output
Following is the output on console −
16