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

Last update on May 30 2022 10:07:59 (UTC/GMT +8 hours)

JavaScript Array: Exercise-19 with Solution

There are two arrays with individual values, write a JavaScript program to compute the sum of each individual index value from the given arrays.

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:

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>compute the sum of each individual index value from two arrays</title>
</head>
<body>
</body>
</html>

JavaScript Code:

function Arrays_sum(array1, array2) 
{
  var result = [];
  var ctr = 0;
  var x=0;

  if (array1.length === 0) 
   return "array1 is empty";
  if (array2.length === 0) 
   return "array2 is empty";   

 while (ctr < array1.length && ctr < array2.length) 
  {
    result.push(array1[ctr] + array2[ctr]);
    ctr++;
  }

 if (ctr === array1.length) 
 {
    for (x = ctr; x < array2.length; x++)   {
      result.push(array2[x]);
    }
  } 
  else
  {
  for (x = ctr; x < array1.length; x++) 
    {
      result.push(array1[x]);
    }
  }
  return result;
}

console.log(Arrays_sum([1,0,2,3,4], [3,5,6,7,8,13]));

Sample Output:

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

Flowchart:

ES6 Version:

function Arrays_sum(array1, array2) 
{
  const result = [];
  let ctr = 0;
  let x=0;

  if (array1.length === 0) 
   return "array1 is empty";
  if (array2.length === 0) 
   return "array2 is empty";   

 while (ctr < array1.length && ctr < array2.length) 
  {
    result.push(array1[ctr] + array2[ctr]);
    ctr++;
  }

 if (ctr === array1.length) 
 {
    for (x = ctr; x < array2.length; x++)   {
      result.push(array2[x]);
    }
  } 
  else
  {
  for (x = ctr; x < array1.length; x++) 
    {
      result.push(array1[x]);
    }
  }
  return result;
}

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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Next: Write a JavaScript program to find duplicate values in a JavaScript array.

JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());

Ref: https://bit.ly/2BXbp04