Asynchronous Programming - Reading Assignment

[FunCoupons]

1. Synchronous functions finish their execution one by one while asynchronous functions could be executing parallel while other functions are executing in the main thread.

2. Callback hell is when you call a function which receives a function, receives another function, etc…

3. Promises and asynchronous functions are ways to avoid callback hell.

[Narnia]

What is the difference between synchronous and asynchronous functions?
Synchronous functions occupy the browser’s full attention while it completes the first event handler.
Asynchronous functions can initiate tasks and then put them aside until ready.

What is callback hell?
Callback hell is when complex operations produce even more levels and sub-levels of nested functions.

Which technique can help us solve callback hell?
Promises is part of a built-in library in jQuery and can be used to deal with excessive callbacks and errors.

[kylemoore8]

1. Synchronous functions block the program’s further execution until something is done while Asynchronous functions do not block the program and wait while the program thread does other task.

2. Callback hell is caused when writing JavaScript in a way where execution happens visually from top to bottom while using a lot of asynchronous functions or callbacks. This can slow down the process while tasks are being executed first.

3. Promises are used to prevent callback hell by writing asynchronous code and executing as if it were in a top to bottom fashion.

[ol_frank]

1. Synchronous functions run in a single threaded manner that waits until a task is complete before starting a new task. It blocks the ability to run two things at once. Asynchronous functions on the other hand is able to automatically run the data when it is received and thus handle multiple tasks at once.

2. Callback Hell, is the term given to the build up in complexity that programs begin to develop. It is the build up of levels and sub levels of nested functions that make a program increasingly difficult to navigate.

3. Promises is a built in jQuery library that is used to deal with callbacks and errors

[DaveRad]

1. Synchronous functions are one at a time functions that has to be completed before executing’s the next function.
   Asynchronous functions can be executed and be left alone while other function/s can be executed. The asynchronized function returns a callback when it is completed - then the program can move onto the function that was awaiting the callback, in order to execute.

2. Because of the complexity and vastness of blocks of functions including, multiple nested functions nested, within functions, the callbacks can pile up.

3. This is done with the use of promises. Different libraries have different methods to deal with those promises.

[William_M]

1. What is the difference between synchronous and asynchronous functions? synchronous functions can only run one section of the code at a time and asynchronous functions can run more than one function at a time.
2. What is callback hell? when multiple nested functions are calling on another function.
3. Which technique can help us solve callback hell? by using promises

[mervxxgotti]

1. What is the difference between synchronous and asynchronous functions? — Synchronous runs tasks until completion (sequentially), asynchronous can jump between tasks while one task requires waiting (non-sequentially)
2. What is callback hell? —- where nested callback functions make simple functions complex to track since there becomes so many layers and sub layers
3. Which technique can help us solve callback hell? — promises or extend runtime so asynchronous appear synchronous again

[Toddness]

1. What is the difference between synchronous and asynchronous functions? Synchronous tasks are done to completion before the browser can look at and attempt the next task. Asynchronous functions can be started, put to one side, while another task is completed, then finish when ready to do so.

2. What is callback hell? complex function operations with many levels and sub levels to juggle the tasks and their sequencing.

3. Which technique can help us solve callback hell? We ship in a library that extends the runtime to manage the call backs and errors.

[Reach.Higher]

1. What is the difference between synchronous and asynchronous functions?
   Synchronous functions are when one function runs at a time. Asynchronous functions are when multiple functions, nested within each other, run at one time
2. What is callback hell?
   When you call a function that has another argument, another argument and another making it difficult to read an more prone to error.
3. Which technique can help us solve callback hell?
   Promises like jQuery library is an example to handle callback hell.

[Dougal]

1. What is the difference between synchronous and asynchronous functions?
   Synchronous functions proceed one function at a time and thus subsequent functions must wait until the previous function has been completed.
   Asynchronous functions are functions that can be initiated and then put aside until a response to the function query has been received or alternatively a set waiting time expires.

2. What is callback hell?
   Callback hell is where nested functions get completely unmanageable if they become too numerous.

3. Which technique can help us solve callback hell?
   By using JQuery Promise Library or Node.JS Meteor Fibers Package.

[SkillTulli]

1. Functions that keep the JavaScript engine busy until they finish executing. Asynchronous functions solve this problem because they do not block JS and wait for it to finish the other tasks.

2. Callback hell is when several nested functions are being performed waiting for callbacks.

3)Promises can solve the call back hell situation. jQuery, AngularJS come with promise library. NodeJS allows an extension of runtime to abstract the asynchronicity away

[lampacenter]

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

Whereas a synchronous task will occupy Jave continuously until its completion, an asynchronous task can be initiated and then put aside until a later date while our valet gets started on the next task on his to-do list.

2.What is callback hell?

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?

In the browser, a common pattern to deal with excessive callbacks is to use promises. jQuery ships with a simple built-in promise library that enables us to chain callbacks and deal with errors.But in Node.js, we can use a different approach. By extending the runtime, we can abstract away the asynchronicity and write code that looks sychronous.For example, this is what Meteor does behind the scenes using the Fibers package.

[Bhujanga]

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

synchronous functions block the browser for new input until the function callback is fulfilled.
Asynchronous functions to not wait for the reply and continue with other tasks immediately and go back to the function when it’s callback has arrived.

2. What is callback hell?

When there are multiple layers of nested functions that all depend on each other.

3. Which technique can help us solve callback hell?

jQuery comes with a promises library. promises represent the final outcome of an asynchronous operation. Depending on the outcome of the operation errors or successfully computed data will be attached to the promise.

[mr_nv]

1. What is the difference between synchronous and asynchronous functions?
   Synchronous functions are when one function runs at a time. Asynchronous functions are when multiple functions, nested within each other, run at one time
2. What is callback hell?
   When you call a function that has another argument, another argument and another making it difficult to read an more prone to error.
3. Which technique can help us solve callback hell?
   Promises like jQuery library is an example to handle callback hell.

[Fahd_Sef]

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

• Synchronous task will occupy Javes continuously until its completion, an asynchronous task can be initiated and then put aside until a later date while our valet gets started on the next task on his to-do list.

2. What is callback hell?

• Is more complex operations tend to produce even more levels and sub-levels

3. Which technique can help us solve callback hell?

• Use promises
• jQuery ships with a simple built-in promise library that enables us to chain callbacks and deal with errors.
• Node.js, we can use a different approach. By extending the runtime, we can abstract away the asynchronicity and write code that looks sychronous.

[Louwrens]

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

• synchronous functions executes code one line at a time, and if it has to wait for something, nothing else can get done
  -asynchronous functions looks to be basically nested functions and will run on it’s own once the elements have been loaded, while the program can go on while it waist.

2. What is callback hell?

to many functions in functions waiting for responses.

3. Which technique can help us solve callback hell?

Promises and Fibers

[Samtoshi]

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

Synchronous functions happen in succession step 1 then 2 then 3 and so on where the first must be completed before the 2nd can begin. Whereas asynchronous functions can be initiated and then wait to be completed while other functions down the line are initiated. Which allows us to not lockup the browser while we wait for the first task to be completed.

2. What is callback hell?

When we stack many functions inside of other functions that are all dependent on one another. Which makes it difficult to track down errors because it’s all dependent on each other so you sometimes have to untangle a whole system to find out where the error is.

3. Which technique can help us solve callback hell?

Using the promise library that jQuery comes with we can write code in a way that appears synchronous and helps us to “chain callbacks and deal with errors”.

[Karla]

@ivan

• What is the difference between synchronous and asynchronous functions?
• What is callback hell?
• Which technique can help us solve callback hell?

1. A synchronous function needs to be executed before the program can move on to the next task. Whereas an asynchronous function can be initiated and then put aside. The program does not need to wait for its execution to work on the next task.

2. Callback hell is a complex code with several sub-levels. Basically several asynchronous functions nested in one another.

3. One way to solve them are promises, which provide a temporary value which is pending up until it is resolved or rejected.
   Another way is abstracting the asynchronicity and write code that looks synchron. This is possible with Meteor in Node.js.

[stevesirag]

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

Synchronous functions are ones that the single-threaded JavaScript operator can handle one at a time with acceptable results.

Asyncrhonous functions are ones that may take a long time or even fail, and we don’t want to lock up the browser or server while waiting for those completions.

2. What is callback hell?

It’s when there are enough asynchronous actions nested up that one callback blocks another, and nothing works.

3. Which technique can help us solve callback hell?

Using Meteor, a client & server-side library, we can write synchronous code that runs asynchronously.

[santiago]

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

Synchronous functions occupy JavaScript continuously until their completion. Asynchronous functions can be initiated and then put aside until a later date while JavaScript gets started on the next event handler function.

2. What is callback hell?

Callback hell is the term used when there’s lots of complex operations that tend to produce levels and sub-levels.

3. Which technique can help us solve callback hell?

We can use promises to deal with excessive callbacks. jQuery includes a promises library that enables us to chain callbacks and deal with errors.