Why would someone like to use JavaScript as his main language?

Why would someone like to use JavaScript as his main language?

References

Reference NO 1

http://stackoverflow.com/questions/15197590/why-would-someone-like-to-use-javascript-as-his-main-language

Reference NO 2

http://www.quirksmode.org/js/intro.html

Reference NO 3

http://yehudakatz.com/2011/08/12/understanding-prototypes-in-javascript/

Reference NO 4

http://ejohn.org/blog/asmjs-javascript-compile-target/

Reference NO 5

http://www.dartlang.org/support/faq.html

Reference NO 6

http://tomdale.net/2012/01/amd-is-not-the-answer/

Reference NO 7

http://programming.oreilly.com/2013/07/javascript-is-way-too-slow-for-what.html

Reference NO 8

http://www.netmagazine.com/features/10-things-you-didnt-know-javascript-could-do