Understanding the Difference Between Asynchronous and Synchronous Programming
Tags: programming, beginners, angular, computerscience
Published: 2023-07-22 05:23:40

## Introduction
In the computer programming, programmers frequently come across situations where they must manage multiple tasks simultaneously or one after the other. Asynchronous and synchronous programming plays an important role in these situations. Both of these paradigms provide unique methods for handling tasks and allocating resources within a program. This article will examine the distinctions between asynchronous and synchronous programming, as well as its applications, benefits, and drawbacks.

### Synchronous Programming

Synchronous programming is a traditional approach for carrying out operations in a program and also it is known as blocking or sequential programming. Tasks are carried out sequentially in this paradigm, and each task must be executed before the next may get started. For an example, there is a queue to purchase a train ticket from the counter. People have to wait to buy a ticket, each person needs to complete their purchase before the next one can proceed.

![Synchronous Programming](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/5jzw6w22l8tx1iwkgrmy.jpg)

#### Advantages

- Simplicity: It is easy to understand and implement programs. It saves the software development time.
- Predictable: Tasks run sequentially, making the software behavior more predictable and simpler to debug. Many search engines find synchronous web pages easier to crawl.

#### Disadvantages

- Performance: Synchronous operations can lead to performance issues, especially when performing with time-consuming tasks, as the program may idle while waiting for the task to complete and it doesn’t allow to allocate resources to other task. If a one task fails, the entire program becomes unresponsive as well.
- Resource Wastage: Other activities may remain idle, wasting resources and reducing the efficiency, while one task waits for I/O operations (such as reading from a file or retrieving data from a network).

#### When to use Synchronous programming?
Commonly, Synchronous Programming is used to develop simple applications with straightforward process. It is most suitable to build computational applications such as simple calculators.

### Asynchronous Programming
On the other hand, asynchronous programming is a non-blocking method where tasks are started but not always finished sequentially. The program can run various jobs until the outcome is available rather than waiting for one task to finish. Because of the parallelization, an asynchronous software can handle several requests concurrently and independently.  It doesn’t depend on subsequent requests when one request fails. A task can be started before it is finished by the program, which can then switch to it. As result we can get the advantage of loose coupling in software development. For an example, texting is an asynchronous communication method that text message can be sent by one person, and the recipient can reply whenever they want. While waiting for a response, the sender may engage in other activities such as listening to the music.

![Asynchronous Programming](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/f1sg020b1hvi4l3yg67g.jpg)

#### Advantages

- Improved Performance: The ability of the program to work on other tasks while awaiting the results of time-consuming activities makes asynchronous programming more efficient and responsive. For an example, if the software or website loads all of its scripts at once, improving responsiveness and reducing page load times. In Asynchronous Programming, it will load required scripts at the required time by particular requests.
- Efficient Resource Utilization: Asynchronous programs handle more simultaneous activities while utilizing less resources because they don't block threads.
- Scalability: Programs can be expand without more complication because most tasks are not depend on others.

#### Disadvantages

- Complexity: Concurrency needs to be managed and there could be some conditions, asynchronous programming can be more difficult to design and debug. Due to that, code itself can get complex and developers will unable to write clean codes.
- Callback Hell: If the code is not handled properly might result in "callback hell," where there are many nested callbacks that make the code difficult to comprehend and maintain.

#### When to use Asynchronous programming?
We can use Asynchronous programming to build real-time applications such as online gaming or chat applications, where responsiveness is important. And also the applications that use I/O bound operations, such as reading/writing files.

#### Integrating Synchronous and Asynchronous Programming
In many situations, combining the two paradigms can provide the valuable advantages. To handle concurrent processes like I/O operations, an application might use asynchronous programming and the computational and logical processes, application can use synchronous programming.

#### Conclusion
Asynchronous and synchronous programming are two important strategies to task execution in computer programming. Each has its own advantages and disadvantages. Usage of these approaches totally depend on the nature of the applications and developers should manage their code efficiently when they using these approaches to avoid bottlenecks. We will discuss, how to handle these approaches in the code base using Angular in the next article.