Asynchronous Programming - Reading Assignment

[floydsantimano]

1. What is the difference between synchronous and asynchronous functions?
   Synchronous functions are those that block the program’s flow of execution until the current execution is complete. Asynchronous functions permit other executions simultaneuosly while completing the current executions.

2. What is callback hell?
   It is the situation where several callback are within callbacks in the code making it complex.

3. Which technique can help us solve callback hell?
   Promises allow us to simplify callbacks and deal with errors.

[Melshman]

1. Synchronous functions execute almost instantly and in succession. Asynchronous functions may require time to return from their initial call.
2. Callback hell is the name programmers have given to the situation when nested asynchronous functions are called.
3. Using promises allows our code to get on with its business while waiting for some functions to return.

[Chris_Adrian]

1. What is the difference between synchronous and asynchronous functions?

Synchronous functions happen sequentially, requiring one piece of the function to finish before moving on to the next. With Asynchronous functions, functions can start a process, and then move on and perform other taks while waiting for that process to finish, and then resume where it left off.

2. What is callback hell?

Callback hell is when multiple nested asynchronous functions all try and start callbacks, resulting in hard to read code that is prone to errors.

3. Which technique can help us solve callback hell?

By using promises in jQuery to chain callbacks and deal with errors or, on servers, by extending the runtime to abstract away asynchronicity of functions.

[tanu_g]

1. What is the difference between synchronous and asynchronous functions?
Synchronous functions are more like non-preemptive scheduling in operating systems, where a single process takes the resources and holds them till the process gets terminated.

In the case of asynchronous functions, while one event is in the waiting state, another event can start its execution.

2. What is callback hell?
Callback hell is an unwanted situation where a smile task requires a series of nested callback functions and hence makes the task cumbersome.

3. Which technique can help us solve callback hell?
Promises can be used to deal with Callback hell which ships with jQuery.
Also, to abstract away the asynchronicity, the runtime can be extended in Node.js.

[KK_Cheah]

1. What is the difference between synchronous and asynchronous functions?
   Synchronous functions are functions that must be fully executed before moving on to another function, while asynchronous functions are functions that can be executed and left while to perform another function until a callback is issued and the remaining portion of the former function can be executed.

2. What is callback hell?
   multiple levels of nested callbacks that can codes feel confusing and messy

3. Which technique can help us solve callback hell?
   jQuery has promises that can allow an environment to chain callbacks while Node.js has the ability to extend runtime to give a feel of synchronous function while still remaining asynchronous

[Avinash_Chulani]

1. A synchronous function will occupy a task until it is done, an asynchronous function can be started and set aside to complete later.

2. When you execute multiple asynchronous operations one after the other.

3. Promises.

[Flippy]

1. Synchronous function reads your code from top to bottom and the asynchronous function works depend on the code you put in there like setInterval, 100 so the code will work after that given time and that for me is an example of an asynchronous function.

2. Bunch of callbacks and very difficult to work on.

3. We can use promises to solve the problem with callback hell.

[WhitneyPaterson]

1. What is the difference between synchronous and asynchronous functions?
   A synchronous function blocks the program execution until finished. An asynchronous task can be initiated and then put aside until called back.

2. What is callback hell?
   Many callbacks within callbacks.

3. Which technique can help us solve callback hell?
   Promises

[Daniel.P]

1. What is the difference between synchronous and asynchronous functions?

Synchronous tasks will make the browser non responsive to any events until it completes the first handler, meanwhile an asynchronous task can be initiated and then put aside until a later date.

2. What is callback hell?

A simple operation can require three levels of nested functions. So you can
imagine that more complex operations tend to produce even more levels and sub-levels,
which is what is poetically known as callback hell.

3. Which technique can help us solve callback hell?

A common pattern to deal with excessive callbacks is to use promises.

[Robert12]

1. What is the difference between synchronous and asynchronous functions?
   Synchronous function means, they run one after another. Asynchronous means they are initiated and then put aside until a later date, so different code can be run at the same time.

2. What is callback hell?
   When complex operations tend to produce a huge amount of levels and sub-levels (nested functions).

3. Which technique can help us solve callback hell?
   Working with promises (chaining of callbacks).

[kiwi]

1. What is the difference between synchronous and asynchronous functions?
Synchronous functions block the JavaScript engine’s ability to do any other task. In other words, when a synchronous function is being run, no other code can execute until it the function reaches completion.

Asynchronous functions allow tasks to be initiated, then set aside while other code is being executed. The program can then return back to the asynchronous function once it has finished being executed.

2. What is callback hell?
A callback is a function that is passed as an argument to another function. From what I understand, if a callback function A is passed to another function B, in order for B to finish executing, we first have to wait for A to finish.

Callback hell is when we have way too many nested callback functions, creating a sideways pyramid shape in our code like this: >
It becomes very difficult to keep track of all the individual nested callbacks and it also makes our code messy. Avoid whenever possible!

3. Which technique can help us solve callback hell?
We can avoid callback hell by using Promises, which lets us code in a more easily understandable way.

[silviyaPB]

1. What is the difference between synchronous and asynchronous functions?

• A synchronous function blocks the thread until it is ready to return a result.
  An asynchronous function releases the thread before the result is read to be returned.
  It instead takes another function (callback) that is invoked when the result is ready.

2. What is callback hell?

• The number of nested callback functions can grow rapidly and make the code hard to read.

3. Which technique can help us solve callback hell?

• We can use libraries that hide the “callback hell” behind “synchronous looking” functions.

[HRMS2021]

1)What is the difference between synchronous and asynchronous functions?
Synchronous - basically means that you can only execute one thing at a time.
Asynchronous - means that you can execute multiple things at a time and you don’t have to finish executing the current thing in order to move on to next one.

2)What is callback hell?
One of the best ways to reduce code clutter is by maintaining better separation of code. If you declare a callback function beforehand and call it later, you’ll avoid the deeply nested structures that make callback hell so difficult to work with.

3. Which technique can help us solve callback hell? Promises can be used to solve callback hell. For example, to convert callbacks into promises, we need to create a new promise for each callback. We can resolve the promise when the callback is successful. Or we can reject the promise if the callback fails.

[Jbomb2020]

1
a. synchronous is tasks that will contstantly need attention till its completion.
b. asynchronous can be started but completed whenever.

2. callback hell is multiple functions and operations running at once.

3. promises in jquery.

[Experiment]

@ivan

1. What is the difference between synchronous and asynchronous functions?

A synchronous function is one that essentially occupies “Jave’s” full attention taking him away from performing other tasks, or lines of code. In summary: synchronous functions require completion before moving further through the code. An asynchronous function is the inverse of this, meaning the task is set aside so the program can continue while waiting.

@ivan

2. What is callback hell?

Callback Hell is the name affectionately given to a group of overly-nested callback functions. Could almost call it a potential rabbit hole…

3. Which technique can help us solve callback hell?

The technique to help solve callback hell problems are promises. These hide nested callbacks into a much more manageable code.

[MarL]

1. Synchronous functions are function that can be execute only one on one, for a new synchronous function to be launch the other has to be finished. Whereas asynchronous functions alloww other function to begin before the last one is completed.
2. Callback hell are when there is too much nested function running at the same time, that is hard to understand what is happenning.
3. The main technique used to solve callback problem is promises, which permit to chain callback.

[r0bz078]

1. What is the difference between synchronous and asynchronous functions?
   The main difference between synchronous and asynchronous calls in Java is that, in synchronous calls, the code execution waits for the event before continuing while asynchronous calls do not block the program from the code executionstrong text. A programmer can pass callback function to another function as an argument. It is executed after an event.
2. What is callback hell?
   Callback hell means that you have multiple functions that are asynchronous. Those functions depend on each other, which might, in turn, get quite messy with a lot of callback function that is nested in multiple layers. This will result in chaos, and you will end up with code which is hard to read and maintain.
3. Which technique can help us solve callback hell?
   One of the things that has been proposed as a solution to Callback Hell is Promises, and with Promises it basically lets you chain. Instead of nest, it lets you chain. When you chain, you can go straight down at the same indentation level. That is nice, because you don’t have this major problem of ever increasing indentation.

[Jaakko_K]

1. Synchronous functions can only be run one at a time. Asynchronous functions keep running at the background and won’t lock the browser up while working on a task.

2. That’s when operations require multiple levels and sub-levels of functions to complete.

3. In jQuery we can use promises to chain callbacks and deal with errors.

[supertramp007]

1. What is the difference between synchronous and asynchronous functions? synchronous task will run continuously until its completion, an asynchronous task can be initiated and then put aside until a later date
2. What is callback hell? multiple levels of complex nested functions
3. Which technique can help us solve callback hell? promises

[Ben17]

1. What is the difference between synchronous and asynchronous functions?

A synchronous function is a function that needs to be completed before JavaScript can begin to execute another task. An asynchronous function is a function that can begin and, prior to completion, JavaScript can set it off to one side and work on other tasks while waiting for it to finish processing.

2. What is callback hell?

When an asynchronous function is launched, and subsequently put aside to wait for completion, the event that calls JavaScript’s attention back to the function upon completion is called a callback. If you find yourself in a situation where you have many, many asynchronous functions all waiting to complete, with some of them dependent on the completion of others before they can be finished, the browser can experience speed problems and the code can become difficult to manage. This is colloquially known as callback hell.

3. Which technique can help us solve callback hell?

In jQuery, one can use promises to deal with callback hell.