There are feebacks of four writers on Document Object Model (DOM) and JavaScript
ID: 3866194 • Letter: T
Question
There are feebacks of four writers on Document Object Model (DOM) and JavaScript Events. I need individual responses to each of these writers asap. Please answer all questions for THUMBS UP
Writer1
I was searching for a simple definition for the DOM, and I think I found one. According to Chris Coyier's blog, the DOM is not the HTML you write, but the HTML written is parsed by the browser and turned into the DOM. View source isn't the DOM either, but rather it shows you the HTML that makes up the page, or what you just wrote if the case may be. The code in your DevTools is the visual representation of the DOM. If there are mistakes in your HTML, the browser may insert what you're missing, and you'll find it in the DOM. Pretty nifty for an interface where you can build your document and modify it as needed.
Reference: https://css-tricks.com/dom/
Writer2
The Document Object Model (DOM) is at the core of every HTML page. In order to develop dynamic HTML pages, a front-end developer needs to understand how JavaScript connects to and controls the DOM, allowing you to create, modify, delete, and edit existing page content. This course focuses on helping you understand the DOM elements, and shows the different ways JavaScript gives you access to them and makes it easier to work with the DOM. Author Ray Villalobos covers navigating the DOM, selecting elements, modifying HTML attributes, editing nodes, and much more.
Writer3
An electromagnetic field or current, also known in specific pieces as a signal is used to transmit data from one place to another. They can range in complexity from the original beeping Morse Code for instance, all the way up to high speed fiber optic signals used to send massive amounts of data. When it comes to digital signals there has to be a great deal of error checking and correction in order to ensure data integrity. There are many methods for accomplishing this, vertical, longitudinal and cyclical redundancy checks being some of the more common. One such example is a Checksum error detection. What this does is basically make a list in binary of the data as a packet and store it within the data itself. Once the data has been transmitted it creates a new checksum and compares it with the one that it received to make sure they match. Very simple but also highly useful. This also highlights the necessary act of encoding and then decoding a message. In order to send an entire chunk of information it must be separated into packets when sent digitally. Encoding is the act of creating the packet and providing it the necessary network and destination information while it is being sent, and decoding it is what a system will do once it is received making the data useful and essentially 'opening' it.
Rouse, M. (n.d.). What is signal? Retrieved August 3, 2017, from http://searchnetworking.techtarget.com/definition/signal
Checksum Definition. (2005, November 4). Retrieved August 3, 2017, from http://www.linfo.org/checksum.html
Writer4
Signal Definition
A signal is an electromagnetic field or current that transmits data from one location to another. Data is superimposed on a wave through modulation, which can be done in two methods: analog and digital. Digital signals are becoming more common, meanwhile analog applications are becoming more antiquated (TechTarget, n.d.).
Error Detection Methods
Error checking is a method of integrity assurance when transmitting, processing, and storing data. Storing and transmitting data is subject to real-world conditions such as electrons, photons, atoms, wires, contacts, and more; these factors present an ever-present uncertainty of data corruption.
One of the most popular methods of error-checking is parity, where a single extra bit is added to each byte of data and assigned a value of 1 or 0 according to if there was an odd or even number of “1” bits. The receiving system calculates what the parity bit should be, and if the results don’t match, then the system knows some bit (s) are missing. This method, however, is prone to inconsistency if 2 bits have been altered because the changes are canceled out, consequently not signaling an error (Kay, 2004).
Checksum is a method that sums all the bits of a message, program, or document and produces a value. Next, cyclic redundancy check (CDC) operates on groups of bits at a time and uses division, instead of addition. Both CRC and checksum are calculated prior and after transmission or duplication of data, then compared. The downfall to both of these methods is that they cannot verify data integrity, because the algorithms are knowns and it is possible to introduce intentional changes that these two methods won’t detect. (Kay, 2004).
Signal Encoding and Decoding
When data is transformed into a different format so that there is an increased level of security and data integrity. Decoding is the process of converted received encrypted data back into its intended original format (Indika, 2011).
References
Definition: Signal. (n.d.). TechTarget. Retrieved from http://searchnetworking.techtarget.com/definition/signal
Indika. (2011, July 7). Difference between encoding and decoding. Retrieved from http://www.differencebetween.com/difference-between-encoding-and-vs-decoding/
Kay, R. (2004, November 1). Error checking and correction. Retrieved from http://www.computerworld.com/article/2568133/business-intelligence/error-checking-and-correction.html
2 What is the average earnings of this sample? D Question 8 10 pts a nationally representative data set, we know that the average earnings is $20,000. Is the data From from our sample representative of the population? Explain. HTML Editor ParngraphExplanation / Answer
Solution:
Writer1:
This writer talks about what is not DOM, rather than what is DOM. He just gives a one line hints to know what are the assumptions about DOM. He doesn't clearly stated what exactly DOM is and how that is working.
Writer2:
This person just gives an abstract about what is DOM and what can be achieved using DOM. But he too doesn't give any detailed documentation about DOM.
Writer3:
This writer discusses what signal is and how this can be used in transformation of data. Also use of checksum detection is being discussed.
Writer4:
This person also discussed both what signal is and the cons and pros of checksum detection and parity checking.
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