Скачать или смотреть How to Execute a Function for Every Element in an Array with a Delay in JavaScript

Learn how to create asynchronous functions in JavaScript that process each element in an array with a delay. This step-by-step guide walks you through printing numbers, filtering them, and managing delays effectively.
---
This video is based on the question https://stackoverflow.com/q/76479100/ asked by the user 'Owen Walstrom' ( https://stackoverflow.com/u/22076201/ ) and on the answer https://stackoverflow.com/a/76479477/ provided by the user 'tlvi38' ( https://stackoverflow.com/u/6506296/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How do I execute a function for every element in an array with a 2 second delay and then repeating

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Mastering Asynchronous Execution in JavaScript

When working with arrays in JavaScript, you may come across scenarios where you need to process each element with a certain delay in between executions. This can be particularly useful for making your applications feel more polished and user-friendly. In this guide, we explore how to execute a function for every element in an array with a 2-second delay, ensuring that each of the three main steps operates sequentially.

The Problem Explained

You want to accomplish the following tasks sequentially with delays:

Print out numbers in an array with a 1-second delay between each number.

Remove odd numbers from the array and pause for 2 seconds after this process.

Print out the remaining numbers in the array, also with a 1-second delay between each output.

Additionally, each of these main steps should only start once the previous one has fully completed, ensuring a smooth flow of information.

Breaking Down the Solution

Here's how we will approach solving this challenge:

Step 1: Setting Up a Delay Function

First, we need a function that allows us to create a delay. For this, we can utilize JavaScript's Promise and setTimeout:

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

Step 2: Defining the Array and Initial Functions

Next, let's define our array and set up our main functions for each step:

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

Step 3: Chaining the Processes

Now that we have our individual processing functions, we can chain them using Promise.all:

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

Conclusion

By using Promises and async/await, we can handle asynchronous flows seamlessly in JavaScript. This structure not only allows you to execute functions with delays but also ensures that each step completes before moving on to the next.

Feel free to adapt this code snippet to fit your specific needs, such as modifying the number of iterations or changing the delays. Mastering this pattern will enhance your JavaScript skills and improve your coding capabilities in asynchronous environments. Happy coding!