Creating Dynamic Variables in Node.js with Puppeteer

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The Problem

Imagine you are developing an application that requires you to launch multiple browser instances simultaneously. Hardcoding each instance with static variable names not only clutters your code but also makes it less manageable. A common issue developers face is how to dynamically create these variable names and manage multiple browser contexts and pages without excessive repetition.

Example Scenario

Suppose you want to run six browsers, each with its own browser context and page. Instead of writing lines of code like this:

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

This quickly becomes unwieldy. What if there was a way to simplify this process through a structured approach?

The Solution

To tackle the problem of creating dynamic variables, we can utilize arrays to store browser instances, contexts, and pages. This will keep things organized and accessible without the need for a convoluted naming scheme. Below, I present a step-by-step guide on how to implement this solution.

Step 1: Set Up Your Environment

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

Step 2: Code Explanation

Here’s how you can create browsers dynamically using a loop and store each instance in arrays:

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

Step 3: Break Down of the Code

Setup: We start by requiring Puppeteer and initializing three arrays: browsers, contexts, and pages to store our instances.

Loop:

We run a loop to create and store the specified number of browser instances (size).

Inside the loop, we launch a new browser and push the instance into the browsers array.

For each browser, we create an incognito context and a new page, storing them in their respective arrays.

Close Browsers: After your automation tasks are complete, use a loop to close each browser instance safely.

Benefits of This Approach

Scalability: Easily change the size variable to control the number of instances you need.

Maintainability: Reduces code duplication and improves readability.

Dynamic Management: Offers a structured way to manage multiple browser contexts and pages.

Conclusion