Скачать или смотреть How to Find Array of Objects with Closest edu_end_year to Now Date in JavaScript

A step-by-step guide on how to filter a JSON array of educational records to find the closest graduation year for each employee using JavaScript.
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How to Find Array of Objects with Closest edu_end_year to Now Date in JavaScript

When working with arrays of objects in JavaScript, it’s not uncommon to run into a problem where you want to extract a specific value that meets certain conditions. In this guide, we’ll tackle a common scenario: finding the array of objects with the closest graduation year (denoted as edu_end_year) to today's date for a given employee ID.

The Problem

Imagine you have a JSON array representing educational records for employees, where each record contains an employee ID, the degree, and the year the education ended. Your goal is to filter this data so that for each employee ID, you only keep the record with the most recent edu_end_year that is closest to the current date.

Here’s a sample data set:

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

From this data, we expect the following output:

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

The Solution

To solve this problem, we can utilize a Map to keep track of the highest edu_end_year for each employee ID. The following steps outline the solution:

Step 1: Initialize a Map

We'll start by creating a new Map called maxEducations that will store the most recent educational record for each employee.

Step 2: Loop Through the Array

We’ll loop through each education record and compare the edu_end_year. If we find a record with a higher year for the same emp_id, we will update the Map.

Step 3: Filter the Values

Finally, we can extract the values from the Map and convert it back into an array.

Here’s how the code looks:

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

Code Breakdown

Initialization: const maxEducations = new Map(); creates an empty Map to store our desired records.

Looping through Records: The for loop iterates through each record in the educations array.

Checking and Updating: Inside the loop, we check if there’s already a record for that emp_id. If the current record's edu_end_year is less than or equal to the existing one, we skip to the next iteration.

Storing Results: If the current record is more recent, we update our Map by setting it as the new maximum.

Final Output

Lastly, we convert our Map back to an array with const result = Array.from(maxEducations.values()); to get the result we expect.

Conclusion

Using a Map for this task is a powerful method to ensure that we efficiently keep track of values while eliminating duplicates based on certain criteria. With just a few lines of code, we can filter through complex arrays and get precisely the data we need.

Feel free to use the sample code provided and adjust it according to your dataset or use case! Happy coding!