What is the best method for summing the numerical values of a JSON array?

Question

What is the best method for summing the numerical values of a JSON array?

I have a task to calculate the sum and average of integer values from an Array object. Here is the input array:

Input: [
        {"string": "John", "integer": 7},
        {"string": "Margot", "integer": 8},
        {"string": "Jules", "integer": 4},
        {"string": "Marco", "integer": 19}
       ]

Output: 9.5

The issue I am facing is that even though I have created a function to calculate the average, it does not seem to be working correctly. Can someone help me debug this? The code snippet is provided below:

function calculateAverage(student_grades) {
    sum = 0;
    for(i = 0; i < student_grades.length; i++){
        sum += student_grades[i].integer;
    }
    return sum / student_grades.length;
};

var all_grades = [
        {"string": "John", "integer": 7},
        {"string": "Margot", "integer": 8},
        {"string": "Jules", "integer": 4},
        {"string": "Marco", "integer": 19}
       ]
console.log(calculateAverage(all_grades));

javascript arrays json dictionary object

Answer 1

Answer №1

function calculate_student_average(grades) {
    total = 0;
    for( index = 0; index < grades.length; index++){
        total += grades[index].value;        
    }
    return total / grades.length;
};

Try incorporating array methods like map and reduce for a more concise solution

function calculate_student_average(grades) {
    total = grades.map(item => item.value).reduce((a,b) => a + b, 0)
    return total / grades.length;
};

Answer 2

function calculate_student_average(grades) {
    total = 0;
    for( index = 0; index < grades.length; index++){
        total += grades[index].value;        
    }
    return total / grades.length;
};

Try incorporating array methods like map and reduce for a more concise solution

function calculate_student_average(grades) {
    total = grades.map(item => item.value).reduce((a,b) => a + b, 0)
    return total / grades.length;
};

Answer 3

Answer №2

Your solution is close, just remember to divide the sum by the length before returning it:

function calculateAverage(grades) {
  let sum = 0;
  let len = grades.length;
  for (let i = 0; i < len; i++) {
    sum += grades[i].value;
  }
  return Math.round(sum * 10 / len) / 10;
};


all_grades = [
        {"name": "Alice", "value": 8},
        {"name": "Bob", "value": 7},
        {"name": "Charlie", "value": 6},
        {"name": "David", "value": 5}
       ]
console.log(calculateAverage(all_grades));

Remember to always use var, let, or const to declare your variables.

Answer 4

Your solution is close, just remember to divide the sum by the length before returning it:

function calculateAverage(grades) {
  let sum = 0;
  let len = grades.length;
  for (let i = 0; i < len; i++) {
    sum += grades[i].value;
  }
  return Math.round(sum * 10 / len) / 10;
};


all_grades = [
        {"name": "Alice", "value": 8},
        {"name": "Bob", "value": 7},
        {"name": "Charlie", "value": 6},
        {"name": "David", "value": 5}
       ]
console.log(calculateAverage(all_grades));

Remember to always use var, let, or const to declare your variables.

What is the best method for summing the numerical values of a JSON array?

Answer №1

Answer №2

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