Asynchronous Programming - Reading Assignment

Javascript Programming
#382
  1. Synchronous functions run sequentially “top to bottom”. While asynchronous functions can “jump around” allowing them to initiate or not.
  2. Complex operations with many levels and sub-levels
  3. Promise Library in jQuery.
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#383

**What is the difference between synchronous and asynchronous functions?
Synchronous functions have only one task in it, but asynchronous functions have more than one task in it.

**What is callback hell?
Callback hell in which has several functions and the relation between them are interrelated.

**Which technique can help us solve callback hell?
Promise libaray

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#384

  1. Synchronous functions does not return until the work is completed or has failed. It waits for each operation to complete, after that only it executes the next operation. Meanwhile an asynchronous functions usually can be initiated and then put aside until a later date and it never waits for each operation to complete, rather it executes all operations in the first only. The result of each operation will be handled once the result is available.

  2. It’s an anti-pattern seen in code of asynchronous programming. It consists of multiple nested callbacks, which makes code hard to read and debug. For example with simple operations, which require three levels of nested functions, while more complex operations tend to produce even more levels and sub-levels.

  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.

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#385

  1. What is the difference between synchronous and asynchronous functions?
    A Synchronous function uses a single-threaded command to execute two events, those handlers are completed one at a time. An Asynchronous function can initiate other tasks while still holding for completion or feeding by the user of a previous handler.

  2. What is callback hell?
    Is when multiple layers of asynchronous nested functions generate revolving callbacks. It compromises smoothness and might asks for more maintenance.

  3. Which technique can help us solve callback hell?
    JQuery built-in library, Fiber, and Meteor allows multiple callbacks running as asynchronous functions.

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#386
  1. What is the difference between synchronous and asynchronous functions?
    Usynchronous functions can be interrupted by another task and synchronous functions complete to the end without interruptions.
  2. What is callback hell?
    It makes code difficult to understand because of the complex amount of function nesting.
  3. Which technique can help us solve callback hell?
    By using promises.
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#387

  1. Synchronous Functions block the program until they are completely executed whereas asynchronous functions need not wait for first task to be completed and can perform next task and come back again when the first one is complete.

  2. Callback hell is when we need several nested functions in order to perform simple tasks.

  3. Promise can solve this situation by enabling us to chain the callbacks and dealing with errors.

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#388
  1. What is the difference between synchronous and asynchronous functions?

Only one task can be done at a one with synchronous functions , while asynchronous task can be initiated and then put aside until a later date while other tasks are being completed.
2. What is callback hell?

Too many if statements and functions causing your javascript to have looping issues.

3.Which technique can help us solve callback hell?
Promises are used to check for errors that can lead to callback hell. It is usually shipped in a built in library in jQuery.

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#389

1. synchronous operations block instructions until the task is completed, while asynchronous operations can execute without blocking other operations.

2. In computer programming , a callback , also known as a “call-after” function, is any executable code that is passed as an argument to other code that other code is expected to call back (execute) the argument at a given time.

3. Promises are used to solve the call back hell situation

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#390

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

Synchronous function run one section of code at any time .
Asynchronous functions run more than one section at any one time.

2.What is callback hell?
It s a situation where several functions are performed in nested form.

3.Which technique can help us solve callback hell?
Promises are used to solve callback hell.
There are also options in different applications to solve callback problem .

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#391

  1. A synchronous function will block execution until it is completed, then the next function will be excuted.
    An asynchronous function will execute what it can then allow execution to move to another function, the original function’s execution will be completed in a callback

  2. Callback hell refers to multiple nested asynchronous functions

  3. jQuery uses promises to solve callback hell by chaining callbacks and handling errors, and Node.js simulates synchronicity by letting us write code in a synchronous style with synchronous control flow.

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#392

Asynchronous Programming - Reading Assignment

  1. What is the difference between synchronous and asynchronous functions?
    Synchronous functions are functions whereby one task is done at a time, and the next task does not begin until the first task is complete. An asynchronous allows for other tasks to be started while another function is still running.

  2. What is callback hell?
    A convoluted nest of operations.

  3. Which technique can help us solve callback hell?
    Using a promise library can chain callbacks and deal with errors. It is a jQuery built in library.

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#393
  • What is the difference between synchronous and asynchronous functions?
    -Synchronous functions, are executed quickly locally, where asynchronous are started locally but depend on answer from third party sources, that may take time.
  • What is callback hell?
    Complex operations can produce many levels of asynchronous calls, that could become hard to manage.
  • Which technique can help us solve callback hell?
    At browser level jQuery has a simple “promise” library, to chain callbacks and handle errors. At the server, when using Node.js could use “Meteor” and simulate synchronicity.
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#394

  1. The difference between synchronous and asynchronous resides in the away which are executed. Synchronous functions executes single pieces of code sequentially whereas asynchronous can be executed parallel, therefore can execute other functions while computing results of first functions.

  2. Callback hell is a term used to describe multiple levels of nested functions.

  3. One strategy is to use promises to deal with excessive callbacks.

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#395
  1. Synchronous function are block program’s execution until something is done/ ready. While Asynchronous function do not block and wait for the program to get ready then only they will execute.
  2. Callback hell is a situation where several functions are being performed in nested form.
  3. Promise is used to solve the call back hell situation. jQuery, AngularJS come with promise library. It also handles errors
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#396

What is the difference between synchronous and asynchronous functions?
Synchronous vs Asynchronous refers to when the response will take place:
Synchronous: it is common to use ‘blocking’ and ‘synchronous’ as synonyms, implying that the entire input / output operation is executed sequentially and, therefore, we must wait to complete to process the result.
Asynchronous: the completion of the I / O operation is signaled later, through a specific mechanism such as a callback, a promise or an event, which makes it possible for the response to be processed lazy. As you can guess, its behavior is non-blocking since the I / O call returns immediately.
What is callback hell?
Callback Hell is caused by bad coding practices when trying to write synchronous language generally. It is called that way when you have a lot of callback functions in your code, this makes the job more difficult.
What technique can help us solve callback hell?
Using promises allows you to deal with returns, and asynchronous wait syntax.

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#397

  1. Synchronous functions are those that occupy your browser’s full attention; they are also called blocking functions. However, they can pose problems. Like us people, a Web browser can complete only one task at a time. Doing more than one task at a time can and will cause problems. On the contrary, asynchronous functions can be initiated at one time and held off from use until later.

  2. Callback hell is the process by which more complex operations produce more levels and sub-levels.

  3. Promises can help us solve callback hell.

Thank you!

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#398

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.

  1. Call Back Hell is where more complex operations tend to produce even more levels and sub-levels.

  2. Promises.

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#399

  1. synchronous functions are tasks that occupy full memory or full attention of javascript engine until the task is done, Asynchronous functions do not wait for the task to complete, they get an instruction to come back when the execution is completed meanwhile they can do other work.

  2. Callback hell is a situation in which we call a function within a function within a function and so on, making the code messy and unreadable. Also making debuging and maintaining hard.

  3. Promises

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#400
  1. Synchronous methods are executed one at a time while asynchronous methods will execute other tasks while waiting for the first tasks to complete.
  2. Callback hell involves dealing with multiple levels and sub-levels.
  3. “Promises” is used to deal with callback hell which enables users to chain callbacks and deal with errors.
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#401
  1. What is the difference between synchronous and asynchronous functions?

    2. Asynchronous functions allow for initiation of requests while not getting stuck waiting for responses and will let the rest of the code run( In parallel) . Synchronous code can get stuck on responses from API's and other things?? and wont allow for the rest of the code to execute.

  2. What is callback hell?

    3. Is the nesting of too many functions in one command. With an extremely complex system you need to modulate and split up functionality as needed.

  3. Which technique can help us solve callback hell?

    4. The use of Promises can help us to chain callbacks and deal with the errors.
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