How to Add Numerical Values of a JSON Array Object in JavaScript

Learn how to efficiently add numerical values in a JSON array and calculate the average with clear code examples.
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How to Add Numerical Values of a JSON Array Object in JavaScript

In today's post, we will tackle a common problem faced by developers when working with JSON data. You may find yourself needing to sum numerical values contained within a JSON array object, and later calculate the average. Whether you're analyzing data from an API or processing local JSON files, this skill is essential. Let’s break down the steps required to achieve this effectively.

The Problem Statement

Imagine you have a JSON array containing student names and their respective grades, structured like this:

[[See Video to Reveal this Text or Code Snippet]]

Your goal is to calculate the sum of the integer values and, subsequently, determine the average.

Analyzing Your Existing Code

You have already begun writing a function to sum the integer values, but you have encountered some issues. Here’s your initial function:

[[See Video to Reveal this Text or Code Snippet]]

Common Pitfall

The primary issue with this code is that it does not return the average value. Instead, it only computes the sum. To get the average, you need to divide the sum by the number of elements in the array.

Solution: Correcting the Code

Here’s how you can modify your function to correctly compute the average:

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Breakdown of the Solution

Variable Declaration:

Use let for block scope variable declaration.

Declare let sum = 0 to store the total sum.

Declare let len = student_grades.length to capture the number of elements in your array.

Summing Up Values:

Loop over each element in the student_grades array.

Use sum + = student_grades[i].integer to add the integer values.

Calculating the Average:

After the loop, return the average using the formula sum / len.

Use Math.round() to round the average to one decimal place for cleaner output.

Logging the Output:

Pass your data to the function and log it to the console to see the result.

Complete Example to Run

Here’s how to implement the entire code:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following these steps, you can successfully sum the numerical values of a JSON array object in JavaScript and calculate their average. Remember to always declare your variables using var, let, or const to avoid potential scope issues. With this knowledge, you can handle similar tasks with ease in your future programming endeavors!

Happy coding!

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