JavaScript: Compute the sum of each individual index value of two or more arrays

JavaScript Array: Exercise-19 with Solution

Sum of Arrays by Index

There are two arrays with individual values. Write a JavaScript program to compute the sum of each individual index value in the given array.

Sample array:
array1 = [1,0,2,3,4];
array2 = [3,5,6,7,8,13];
Expected Output:
[4, 5, 8, 10, 12, 13]

Sample Solution:

JavaScript Code:

// Function to calculate the sum of corresponding elements from two arrays
function Arrays_sum(array1, array2) {
  // Initialize an empty array to store the sum of corresponding elements
  var result = [];

  // Initialize counters for iterating through the arrays
  var ctr = 0;
  var x = 0;

  // Check if array1 is empty, return an error message if true
  if (array1.length === 0)
    return "array1 is empty";

  // Check if array2 is empty, return an error message if true
  if (array2.length === 0)
    return "array2 is empty";

  // Iterate through arrays until the end of either array is reached
  while (ctr < array1.length && ctr < array2.length) {
    // Calculate the sum of corresponding elements and push it to the result array
    result.push(array1[ctr] + array2[ctr]);
    // Increment the counter
    ctr++;
  }

  // Check if array1 is exhausted
  if (ctr === array1.length) {
    // Append the remaining elements from array2 to the result array
    for (x = ctr; x < array2.length; x++) {
      result.push(array2[x]);
    }
  } else {
    // Append the remaining elements from array1 to the result array
    for (x = ctr; x < array1.length; x++) {
      result.push(array1[x]);
    }
  }

  // Return the resulting array
  return result;
}

// Output the result of the function with sample arrays
console.log(Arrays_sum([1, 0, 2, 3, 4], [3, 5, 6, 7, 8, 13]));

Output:

[4,5,8,10,12,13]

Flowchart:

ES6 Version:

// Function to calculate the sum of corresponding elements from two arrays
const Arrays_sum = (array1, array2) => {
  // Initialize an empty array to store the sum of corresponding elements
  const result = [];

  // Initialize counters for iterating through the arrays
  let ctr = 0;
  let x = 0;

  // Check if array1 is empty, return an error message if true
  if (array1.length === 0)
    return "array1 is empty";

  // Check if array2 is empty, return an error message if true
  if (array2.length === 0)
    return "array2 is empty";

  // Iterate through arrays until the end of either array is reached
  while (ctr < array1.length && ctr < array2.length) {
    // Calculate the sum of corresponding elements and push it to the result array
    result.push(array1[ctr] + array2[ctr]);
    // Increment the counter
    ctr++;
  }

  // Check if array1 is exhausted
  if (ctr === array1.length) {
    // Append the remaining elements from array2 to the result array
    for (x = ctr; x < array2.length; x++) {
      result.push(array2[x]);
    }
  } else {
    // Append the remaining elements from array1 to the result array
    for (x = ctr; x < array1.length; x++) {
      result.push(array1[x]);
    }
  }

  // Return the resulting array
  return result;
};

// Output the result of the function with sample arrays
console.log(Arrays_sum([1, 0, 2, 3, 4], [3, 5, 6, 7, 8, 13]));

Live Demo:

See the Pen JavaScript - Compute the sum of each individual index value of two or more arrays - array-ex- 19 by w3resource (@w3resource) on CodePen.

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