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Youngho Chaa cha cha

Sorting a list of objects by date in JavaScript

typescript, javascript1 min read

I have an API endpoint running on AWS lambda, written in TypeScript. The endpoint returns a list of jobs, which are service tasks performed by Gas engineers to address issues with installed boilers.

One of the main stakeholders has expressed a requirement to view the list of jobs sorted by the reportDate property. However, there is a challenge since reportDate is stored as a string, not a Date. To address this, we need to convert the string into a Date object before sorting the list properly.

In JavaScript, the Array.prototype.sort() function can be used to sort a list. Here is the code snippet to achieve this:

export async function getAllJobsByCompanyId(companyId: string)
: Promise<[Job[], string]> {
const [jobs, errorMessage] = await jobsRepository.getJobs(companyId)
const sortedJobs = jobs.sort((a, b) => {
return new Date(b.reportDate).getTime() - new Date(a.reportDate).getTime()
return [sortedJobs, errorMessage]

In this code, we retrieve the jobs using the jobsRepository.getJobs() method. Then, we sort the jobs based on the reportDate property by converting the string into a Date object using new Date(). The sort() function compares the dates using the getTime() method, ensuring the list is sorted in descending order.

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