JavaScript: Compute the sum of an array of integers

Last update on May 30 2022 10:07:29 (UTC/GMT +8 hours)

JavaScript Function: Exercise-4 with Solution

Write a JavaScript program to compute the sum of an array of integers.

Example : var array = [1, 2, 3, 4, 5, 6]
Expected Output : 21

Pictorial Presentation:

JavaScript: Compute the sum of an array of integers

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Compute the sum of an array of integers</title>
</head>
<body>

</body>
</html>

JavaScript Code:

var array_sum = function(my_array) {
  if (my_array.length === 1) {
    return my_array[0];
  }
  else {
    return my_array.pop() + array_sum(my_array);
  }
};

console.log(array_sum([1,2,3,4,5,6]));

Output:

Flowchart:

Flowchart: JavaScript recursion function- Compute the sum of an array of integers

Live Demo:

See the Pen javascript-recursion-function-exercise-4 by w3resource (@w3resource) on CodePen.

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Previous: Write a JavaScript program to get the integers in range (x, y).
Next: Write a JavaScript program to compute the exponent of a number.

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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