How to Sum the Max from Two Keys in a JavaScript Object

Discover how to efficiently sum the maximum values from similar keys in a JavaScript object using the `reduce` function. Learn to solve this common problem with clear examples!
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How to Sum the Max from Two Keys in a JavaScript Object: A Step-by-Step Guide

Sometimes when working with objects in JavaScript, you may find yourself needing to compute a total sum based on certain criteria involving similar keys. This guide will explore how to calculate the total sum by taking the maximum value from pairs of similar keys in a JavaScript object. Let's take a look at the scenario and the solution to achieve this.

The Problem

Imagine you have an object called score that contains scores for different tasks, along with paired scores denoted by a suffix (|pm). Here's the structure of the object:

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

In this object:

work_1 and work_1|pm are similar pairs where you want the maximum score.

work_2 and work_2|pm are another similar pair.

work_3 does not have a pair.

The goal is to sum the maximums of these pairs and any standalone values, resulting in a total of 28.

The Solution

To achieve this, you can follow a two-step process using JavaScript's reduce function. Here's how to do it:

Step 1: Group the Maximums by Key-Prefix

First, you need to group the maximum values by the prefix of their keys. You can do this by iterating over the entries in the score object and keeping track of maximum values for each key prefix.

Step 2: Sum the Values

After grouping the scores appropriately, the next step is to sum these maximum values to get the final total. You’ll use another reduce to accomplish this.

Implementation

Here is the complete code that accomplishes the above steps:

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

Explanation of the Code

reduce((acc, [k, v]) = {...}): Iterates over the pairs to build a new object acc that will hold maximums.

reduce((a, b) = a + b, 0): Finally sums up these maximum values to produce the total.

Conclusion

By following the steps outlined above, you can efficiently compute the total sum of the maximum values from pairs of keys in a JavaScript object. This method is much cleaner and leverages the power of modern JavaScript functions to achieve the desired outcome succinctly. Give it a try in your own applications, and take your JavaScript skills to the next level!

Feel free to reach out if you have any questions or need further clarification on this process. Happy coding!