Asynchronous Programming - Reading Assignment

Javascript Programming
#101

What is the difference between synchronous and asynchronous functions?

synchronous does everything in the order they come.

asynchronous can pause one task to continue with another.

What is callback hell?

Very complex operations producing many levels and sub-levels in your programming.

Which technique can help us solve callback hell?

In the browser we can use promise library, which is shipped with jQuery.
Promise enables us to chain callbacks and deal with errors.

#102

  1. A 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. Even a relatively simple operation requires 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. 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.

#103

  1. A synchronous function is one where only one task is done at one time. For example, running a simple function. An asynchronous function runs more than one thing at a time.

  2. Callback hell is multiple functions being nested inside one another to the point of it looking and running in a complex and confusing manner.

  3. Promises and different libraries can help with avoiding callback hell.

#104

Synchronous functions are those that are executed linearly, one by one. For the next function to execute, the previous function needs to finish its process. This ties up the system and makes it slower. Asynchronous functions are executed independently from each other, mainly by using a technique called AJAX.

Callback hell is when functions are nested within functions in multiple levels. This makes the processing of the code very inefficient and hellish to manage.

The technique to solve callback hell is called “Promises” – the result of an asynchronous operation. A promise is in one of three states: Pending, Fulfilled or Rejected. Once a promise is fulfilled, it is immutable.

#105
  1. Synchronus functions must be completed before starting next task. Asynchronus functions can be put on hold and wait for some event to happen before completion
  2. It’s a tendency for even simple operations on the website to require nesting multiple functions
  3. In JQuery we can use promises to chain callbacks and deal with errors
#106

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

Synchronous code is code that runs in a linear and chronological order, it will not proceed until the previous instruction is executed. Whereas asynchronous code can run multiple “threads” of code simultaneously, effectively pausing threads while continuing to run others, this is useful where you may need to wait for data from a server while allowing a web-page to continue to function.

2. What is callback hell?

Call back hell is the result of complex asynchronous operations resulting in many levels of nested functions. Even a very simple asynchronous operation can result in a 3 deep nested function.

3. Which technique can help us solve callback hell?

Using promises are one way of dealing with call back hell, promises are part of the jQuery library. Another way is using “Fibers” with “Meteor”.

#107
  1. In a single-threaded environment, only one section of code can be running at one point in time. these tasks require javas full attention which is called blocking or synchronous functions.
    An asynchronous task can be put on pause, move on to the next and come back and finish the task that was put on pause.
    2.Callback hell -Complex operations that tend to have a lot of levels or sub-levels.
  2. In a browser, a common pattern to deal with excessive callbacks is to use promises.
    In node.js we use a different approach. By extending the runtime we can abstract away the asynchronicity and write code that looks synchronous
#108
  1. Synchronous functions occupy the web browser/system continuously until they are completed. Asynchronous functions can we initiated and then put aside until some later point. In a way its like single thread vs. multi threads.
  2. Callback hell is when you have multiple levels of asynchronous callback functions
  3. 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.
#109

What is the difference between synchronous and asynchronous functions?

  • Synchronous functions happen one at a time, where asynchronous functions may use an additional thread to manage the event loop of other functions in the background.

Additional Note: A callback is the function we give to an event.

What is callback hell?

  • Callback hell is the confusion and complexity in code that quickly escalates when using asynchronous callback functions.

Which technique can help us solve callback hell?

  • Apparently “promises” help to deal with a lot of callbacks, though Node.js provides a different approach “to abstract away the asynchronicity and write code that looks synchronous.”
#110

  1. What is the difference between synchronous and asynchronous functions ?
    A synchronous function is when JS triggers an event task lets say for example. it will finish that task and do nothing else before the task is finished, whereas asynchronous functions can be put on hold, and resumed at a later point.
    You might perhaps trigger a function, and for that function to fully complete you might need another function to run aswell. that’s kinda what an asynchronous functon is and how it differs from synchronous functions.

  2. What is callback hell?
    Callback hell is when you have several functions trying to run in a nested form even in a simple task. The more complex the code, the worse it gets.

  3. Which technique can help us solve callback hell?
    There are several ways, but one method to solve this would be to use the promise library.

#111

What is the difference between synchronous and asynchronous functions?

Sync functions are waiting for the response of an event and can not do anything else, until the reponse is sent. Async functions can be put aside until the response is sent and other things can be done in the meantime

What is callback hell?

Even simple operations tend to have many nested functions and therefore many callbacks. Real complex operations lead to a huge amount of callbacks - the callback hell

Which technique can help us solve callback hell?

Promises can help. Promises represent the result of an async operation

#112
  1. Synchronous functions are executed in sequence therefore one has to finish before the next is executed. On the other hand, asynchronous functions can begin a task and then the task can be put aside as it waits for something to happen while the program continues execution.
  2. Callback hell occurs when you have a series of nested callbacks ( for example, when you make use of nested functions that ineract with a network )
  3. The use of promises can help mitigate the problem of callback hell on the browser side. Node.js extends the runtime in a way to make code look synchronous. For example, Meteor uses the Fibers package
#113
  1. A synchronous function must be executed continuously until completion once it is initiated. An asynchronous function can be initiated and then put aside to be completed later on.
  2. It is when callbacks are nested within other callbacks several levels deep that makes it difficult to understand.
  3. Promise is a good technique to solve callback hell.
#114

  1. Synchronous functions are those that are ‘blocking’ that is to say that they occupy the Javascript engine until their execution is finished. Asynchronous function on the other hand do not block the Javascript thread, instead they wait for execution to complete while the thread does other work.

  2. Callback hell occurs when you have an excessive number of callbacks nested within one another, making the code overly complex to manage.

  3. Promises allows us to chain callbacks and deal with errors, which helps make the code easier to read and manage.

#115

  1. A synchronous task will run continuously until it has completed, while a asynchronous task can be initiated and then put aside, while allowing to get started on the next task.

  2. when complex operations produce multiple levels and sub-levels, it is referred as callback hell.

  3. 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.

#116

What is the difference between synchronous and asynchronous functions?

  • Whereas a synchronous task will run code until it is complete, an Asynchronous task can be initiated and then put aside until a later time while other code is being executed.

What is callback hell?

  • Callback hell refers to more complex operations which tends to produce more levels and sub-levels.

Which technique can help us solve callback hell?

  • To deal with excessive callbacks can use promises. JQuery ships with a simple built-in promise library that enables us to chain callbacks and deal with errors.
#117
  1. Synchronous programming: only one section of code at one time. After completion of the execution of the first section the second section get started.
    Asynchronous programming: If for execution of first section of code require some external data which is currently not available, then rather than waiting for 1st section getting complete the execution of second section started.
  2. In asynchronous programming after getting the required data the execution of the first part getting started called the callback. Normally in simple program may having three level of function nesting and if it is the complex program then function nesting goes on increasing means the callbacks also goes on increasing with program complexity. this is called is callback hell.
  3. In browser we can use jQuery inbuilt promise library. In node.js extend the runtime and abstract away the asynchronicity and write simple code that look synchronous.
#118

  1. In synchronous function the program will wait until a certain function/process executes to completion or receives a response from a server before it wil continue with processing other processes in a singlethreaded fashion. Asynchronous functions allow a program to continue to execute other process while waiting on a response or completion of a certain program or querry from a server, or API. It is like a multithreaded process.

  2. Callback hell refers to many nested functions within functions which all need to be executed in a linear singlethreaded way, causing the entire program to potentially stop as it waits or processes on of the nested functions.

  3. Promises,

async / await, futures

#119
  1. What is the difference between asynchronous and asynchronous functions?

Synchronous code is code that runs in a linear order, it will not proceed until the previous instruction is executed. Asynchronous code can run multiple “threads” of code simultaneously, effectively pausing threads while continuing to run others, this is useful where you may need to wait for data from a server while allowing a web-page to continue to function.

  1. What is callback hell?

Call back hell is the result of complex asynchronous operations resulting in many levels of nested functions. Even a very simple asynchronous operation can result in a 3 deep nested function.

  1. Which technique can help us solve callback hell?

Using promises are one way of dealing with call back hell, promises are part of the jQuery library. Another way is using Fibers with Meteor.

#120

Hello @ivan and dear community :vulcan_salute:t2:

  1. What is the difference between synchronous and asynchronous functions :question:

A asynchronous function does not block any further operations. Once a a asynchronous function was executed and is running, the GUI and other functions can be executed in parallel. A synchronous function will block the system until it’s finished.

  1. What is callback hell :question:

This a code pattern where several functions are nested together and each function is related to each other. It’s hard to read and debug.

Basically arguments, within arguments, within arguments, within arguments all waiting for one argument to callback to the other just to start another.

  1. Which technique can help us solve callback hell :question:

There a different methods and implemenations how to solve.

One of them is the use of “Promises”, “Futures” and “Await”.

Cheers
OtenMoten :space_invader: