JavaScript: The Good Parts Vs. JavaScript: The Definitive .

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JavaScript: The Good Parts vs.JavaScript: The Definitive GuideFor next class, read http://eloquentjavascript.net/ chapters 1-4.

C152 – Programming Language ParadigmsProf. Tom Austin, Fall 2014JavaScript

History of JavaScriptIn 1995, Netscape hiredBrendan Eich to implementScheme within the web browser.Brendan EichAfter a few meetings,Scheme was deemed too weird In 10 days, he wrote the initial version of JavaScript(then called Mocha) for Netscape 2.0 Beta.

JavaScript JavaScript looks superficially similar tolanguages like C and Java Primarily client-side programming (i.e. coderunning in your browser & your machine), butsome server-side variants– JVM: Rhino & Nashorn– Node.js http://w3schools.com/js/default.asp

JavaScript is multi-paradigm: Imperative Functional – "Scheme in C's clothing" Object-oriented – Prototype-based

Imperative JavaScriptfunction addList(list) {var i, sum 0;for (i 0; i list.length; i ){sum list[i];}return sum;}

Functional JavaScriptvar addList function(list) {if (list.length 0) {return 0;}return list[0] addList(list.slice(1));}

Object-Oriented JavaScriptfunction Adder (amount) {this.amount amount;}Adder.prototype.add function(x){return this.amount x;}var myAdder new Adder(1);var y myAdder.add(7);

Extended JavaScript Examples(in-class)

Introduction to Node.js

Node.js A JavaScript runtime and library designed foruse outside the browser, based off of Google'sV8 engine npm: package manager for Node.js http://nodejs.org/

myFile.txtThis is my file.There are many like it,but this one is mine.

File I/O in Node.jsvar fs r,data) {if (err) throw err;console.log("" data);});console.log('all done');Callbackfunction

Resulting Outputall doneThis is my file.There are many like it,but this one is mine.

Synchronous File IO in Nodevar data oString());console.log('all done');

Lab: Intro to JavaScriptIn today's lab, you will explore both thefunctional and object-oriented aspects ofJavaScript.See Canvas for details.

History of JavaScript In 1995, Netscape hired Brendan Eich to implement Scheme within the web browser. After a few meetings, Brendan Eich Scheme was deemed too weird In 10 days, he wrote the initial version of JavaScript (then called Mocha) for Netscape 2.0 Beta.

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