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Implementing partial sum over an array using JavaScript
Problem
We are required to write a JavaScript function that takes in an array of numbers. Our function should construct and return a new array in which each corresponding element is the sum of all the elements right to it (including it) in the input array.
Example
Following is the code −
const arr = [5, 6, 1, 3, 8, 11];
const partialSum = (arr = []) => {
let sum = arr.reduce((acc, val) => acc + val);
const res = [];
let x = 0;
if(arr.length === 0){
return [0];
}
for(let i = 0; i <= arr.length; i += 1) {
res.push(sum);
x = arr[i];
sum -= x;
};
return res;
};
console.log(partialSum(arr));Output
[ 34, 29, 23, 22, 19, 11, 0 ]
Updated on: 17-Apr-2021
295 Views
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