CoffeeScript jQuery - CoffeeScript

What is CoffeeScript jQuery?

jQuery is a quick and concise library/framework built using JavaScript created via John Resig in 2006 with a pleasant motto − Write much less, do greater.

jQuery simplifies HTML report traversing, occasion handling, animating, and Ajax interactions for fast net development.

We also can use CoffeeScript to paintings with jQuery. This chapter teaches you how to use CoffeeScript to paintings with jQuery.

Using CoffeeScript with jQuery

Although jQuery solves the browser problems, the usage of it with JavaScript which have some bad components is a chunk complicated.

Using CoffeeScript instead of JavaScript is a better concept.

Hold the following points in thoughts while converting the to be while using jQuery with CoffeeScript.

The $ symbol indicates the jQuery code in our application. Use this to split the jQuery code from the scripting language as shown underneath.

there is no need of using braces in in CoffeeScript besides at the same time as calling the functions with parameters and managing the ambiguous code and we must replace the feature definition feature() with an arrow mark as proven under.

Remove the unnecessary return statements, since CoffeeScript implicitly returns the tailing statements of a function.

Example

Following is an JavaScript code where <div> elements are being inserted just before the clicked element –

Now, we can convert the above code into CoffeeScript code as shown below

On executing, this gives you the following output.

What is Callback?

The callback is an asynchronous equal for a function. A callback function is referred to as at the finishing touch of a given project. Node makes heavy use of callbacks. All APIs of Node are written is this kind of way that they support callbacks.

for instance, a function to read a report may additionally begin studying file and return the control to execution environment immediately in order that subsequent instruction can be carried out. once record I/O is complete, it'll name the callback feature even as passing the callback function, the content of the document as a parameter. So there is no blocking off or wait for the record I/O. This makes Node.js relatively scalable, as it could procedure high variety of request without waiting for any function to return end result.

Blocking Code Example

Create a text file named input.txt having following content

Create a js file named main.js which has the following code −

Now run the main.js to see the result −

Verify the Output.

Non-blocking Code instance

Create a text document named input.txt having following content

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replace predominant.js record to have following code −


Now run the main.js to look the end result −

verify the Output.

These examples provide an explanation for the concept of blockading and non-blockading calls. the first example suggests that this system blocks till it reads the report after which simplest, it proceeds to cease this system, whereas, inside the second instance, this system does now not watch for record analyzing however it just proceeded to print "software Ended".

Thus, a blocking off software executes very a great deal in the collection. From a programming point of view, it’s less difficult to put into effect the common sense but non-blockading programs do no longer execute in sequence. In case a program desires to apply any records to be processed, it ought to be saved inside the same block to make it sequential execution.

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