What is the best way to calculate the total sum of multiple arrays inside an array of objects?

Question

What is the best way to calculate the total sum of multiple arrays inside an array of objects?

I need help figuring out how to calculate the sum of multiple arrays within an array of objects. Here's the code I have:

const employeeList = [    

    {
        "name": "Ahmed",
        "scores": [
            "5",
            "1",
            "4",
            "4",
            "5",
            "1",
            "2",
            "5",
            "4",
            "1"
        ]
    },
    {
        "name": "Jacob Deming",
        "scores": [
            "4",
            "2",
            "5",
            "1",
            "3",
            "2",
            "2",
            "1",
            "3",
            "2"
        ]
    }];

var sum = 0;

for(let i = 0; i < employeeList.length; i++){
    var eachScore = employeeList[i].scores;
    const b = eachScore.map(Number);
    console.log(b);

    sum += parseInt(b);//this is the code that doesn't work

}

console.log(sum);

I'm able to display the arrays in the console, but I can't seem to figure out how to properly sum up the values in each array. Using parseInt with concatenate or simply give me the length of the array instead of the sum. I think using the .split() method could help split the arrays and sum them individually, but I haven't quite nailed down the implementation yet.

javascript arrays json for-loop sum

Answer 1

Answer №1

Since b represents an array of numbers, using the + operator with it will result in a comma-joined string rather than a proper sum. The best approach to summing up an array is by utilizing the reduce method, which allows for iterating over the elements and adding them to an accumulator:

b.reduce((a, b) => a + b);

If you are interested in calculating partial sums, one way could be to use .map to convert each object in the employeeList array into the total sum of their scores. This can be achieved by extracting the scores property and applying the reduce function to add them all together:

const employeeList=[{"name":"Ahmed","scores":["5","1","4","4","5","1","2","5","4","1"]},{"name":"Jacob Deming","scores":["4","2","5","1","3","2","2","1","3","2"]}]

const sum = (a, b) => Number(a) + Number(b);
const output = employeeList.map(({ scores }) => scores.reduce(sum));
console.log(output);
// To calculate the sum of all results:
console.log(output.reduce(sum));

Answer 2

Since b represents an array of numbers, using the + operator with it will result in a comma-joined string rather than a proper sum. The best approach to summing up an array is by utilizing the reduce method, which allows for iterating over the elements and adding them to an accumulator:

b.reduce((a, b) => a + b);

If you are interested in calculating partial sums, one way could be to use .map to convert each object in the employeeList array into the total sum of their scores. This can be achieved by extracting the scores property and applying the reduce function to add them all together:

const employeeList=[{"name":"Ahmed","scores":["5","1","4","4","5","1","2","5","4","1"]},{"name":"Jacob Deming","scores":["4","2","5","1","3","2","2","1","3","2"]}]

const sum = (a, b) => Number(a) + Number(b);
const output = employeeList.map(({ scores }) => scores.reduce(sum));
console.log(output);
// To calculate the sum of all results:
console.log(output.reduce(sum));

Answer 3

Answer №2

To find the total sum, you can utilize array reduce method:

const employeeList = [    
{
  "name": "Ahmed",
  "scores": [
  "5",
  "1",
  "4",
  "4",
  "5",
  "1",
  "2",
  "5",
  "4",
  "1"
  ]
},
{
  "name": "Jacob Deming",
  "scores": [
  "4",
  "2",
  "5",
  "1",
  "3",
  "2",
  "2",
  "1",
  "3",
  "2"
  ]
}];

var sum = 0;

for(let i = 0; i < employeeList.length; i++){
  let eachScore = employeeList[i].scores;
  let b = eachScore.reduce((total,current)=>{
    total += +current;
    return total;
  },0);
  console.log(b);

  sum += b;
}

console.log(sum);

Answer 4

To find the total sum, you can utilize array reduce method:

const employeeList = [    
{
  "name": "Ahmed",
  "scores": [
  "5",
  "1",
  "4",
  "4",
  "5",
  "1",
  "2",
  "5",
  "4",
  "1"
  ]
},
{
  "name": "Jacob Deming",
  "scores": [
  "4",
  "2",
  "5",
  "1",
  "3",
  "2",
  "2",
  "1",
  "3",
  "2"
  ]
}];

var sum = 0;

for(let i = 0; i < employeeList.length; i++){
  let eachScore = employeeList[i].scores;
  let b = eachScore.reduce((total,current)=>{
    total += +current;
    return total;
  },0);
  console.log(b);

  sum += b;
}

console.log(sum);

Answer 5

Answer №3

Here is a helpful solution:

let parsedNumbers = [];
let numbers = [
   "7", "9", "4", "6", "1", "8", "5"
];
let sum = 0;
numbers.forEach(num => {
   parsedNumbers.push(parseInt(num))
})
for (let num in parsedNumbers) {
   sum += parsedNumbers[num]
}
console.log(sum);

Answer 6

Here is a helpful solution:

let parsedNumbers = [];
let numbers = [
   "7", "9", "4", "6", "1", "8", "5"
];
let sum = 0;
numbers.forEach(num => {
   parsedNumbers.push(parseInt(num))
})
for (let num in parsedNumbers) {
   sum += parsedNumbers[num]
}
console.log(sum);

What is the best way to calculate the total sum of multiple arrays inside an array of objects?

Answer №1

Answer №2

Answer №3

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