Add JS entry

Author: GADILA SHASHANK REDDY

book/SUMMARY.md

@@ -55,6 +55,20 @@
 
   * [Conclusion](languages/python/conclusion.md)
 
+* [JavaScript](languages/js/README.md)
+
+  * [Introduction](languages/js/intro.md)
+
+  * [History](languages/js/history.md)
+
+  * [Purpose & Advantages](languages/js/advantages.md)
+
+  * [Disadvantages](languages/js/disadvantages.md)
+
+  * [Some interesting facts](languages/js/misc.md)
+
+  * [Conclusion](languages/js/conclusion.md)
+
 * [C#](languages/csharp/README.md)
 
   * [Introduction](languages/csharp/intro.md)

book/languages/abc/conclusion.md

@@ -9,3 +9,6 @@ one being Python. Despite few design flaws it still is successful in programming
 * [Making of python-An interview](https://www.artima.com/intv/pythonP.html)
 
 * [The official page of ABC](https://homepages.cwi.nl/~steven/abc/)
+
+* Pemberton, S. (1987, January 01). An Alternative Simple Language and Environment for PCs.
+  Retrieved from [here.](https://ieeexplore.ieee.org/document/1695678/)

book/languages/abc/history.md

@@ -2,14 +2,16 @@
 
 ## Creation
 
-ABC was created in the early 1980s by Leo Geurts, Lambert Meertens and Steven Pemberton at
-the Centrum Wiskunde & Informatica (CWI) in the Netherlands. ABC language was developed iteratively
-with it being the fourth iteration. All the previous versions/iterations of this language were called as B.
-
-It is said that the first version of B appeared in 1969. So we can say that ABC went through a long
-phase of development and changes before it took its current form.
-
-Note that B is not a predecessor of the C programming language.
+ABC was created by by Leo Geurts, Lambert Meertens and Steven Pemberton at
+the Centrum Wiskunde & Informatica (CWI) in the Netherlands. It was developed iteratively with ABC
+being the fourth iteration. The first two iterations were developed by Geurts and Meertens at the
+CWI between 1975-76 and 1977-79 respectively. The third iteration was developed between 1979-81 with
+the help of Robert Dewar from the New York University and had "B" as a working title.
+
+After using B for 5 years, Geurts, Meertens and Pemberton came up with a new iteration based on the
+pros and cons of B and other programming languages of the time. They named this language *ABC* and
+as of 1986, it was ready for a formal release and was undergoing final revisions. Probably ABC was
+released to the public in 1987.
 
 ## Purpose
 

book/languages/js/README.md

@@ -1,6 +1,6 @@
 # Oh, hello there
 
-> This chapter has been authored by Konrad Klawikowski and Gadila Shashank Reddy.
+> This chapter has been authored by Skayo and Gadila Shashank Reddy.
 
-Welcome to the JavaScript chapter! I would like to let you know a bit more about
-JavaScript and programming in that language.
+Welcome to the JavaScript chapter! We would like to let you know a bit more about
+JavaScript and programming in JavaScript.

book/languages/js/advantages.md

@@ -21,4 +21,5 @@ static content was served and the user was only able to read it.
 
 Even further improvements meant that JS was able to handle server-side scripts and computing and
 also used in developing native and stand-alone applications instead of being only restricted to the
-browser environment.
+browser environment. Also JacvaScript has a relatively high speed of execution though not as fast
+as C or Rust.

book/languages/js/conclusion.md

@@ -12,6 +12,6 @@ gateway to exploit negligent or non careful users.
 
 ## Regarding the authors
 
-This chapter was originally written by Konrad Klawikowski and additions were made to it
-by Gadila Shashank Reddy. For the original chapter written by Konrad, see
-[here.](https://github.com/Skayo/Community-Programming-Book/tree/e4d4f35d8236ce589e6d8c35df5dd05388e3541f/book/languages/js)
+This chapter was originally written by Skayo and additions were made to it
+by Gadila Shashank Reddy. For the original content written by Konrad, see
+[here.](https://github.com/Skayo/Community-Programming-Book/tree/f8c9cf8fc2d7cad783f85393e3e5103f8bc76b35/book/languages/js)

book/languages/js/misc.md

@@ -12,3 +12,36 @@
 * The Mozilla Foundation was founded in 1998 by the members of Netscape Communications.
 
 * JS is licensed by Oracle to Netscape Communications then and currently to the Mozilla Foundation.
+
+## An Example
+
+This section will compare Hello World program in JavaScript with other languages.
+
+### JavaScript
+
+```JavaScript
+"use strict"  // This declares strict mode and using it is a good security practice.
+console.log("Hello world!");  // semicolon is not mandatory but recommended
+```
+
+### Kotlin
+
+```Kotlin
+fun main(args: Array<String>) {
+    println("Hello world!")
+}
+```
+
+### Python
+
+```Python
+print "Hello world!"
+```
+
+### Ruby
+
+```Ruby
+puts "Hello world!"
+```
+
+Though the example was a simple one, we all start from writing Hello World, don't we? :)