Start work on the JavaScript tutorial

javascript.html.markdown

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+---
+language: javascript
+author: Adam Brenecki
+author_url: http://adam.brenecki.id.au
+---
+
+Javascript was created by Netscape's Brendan Eich in 1995. It was originally
+intended as a simpler scripting language for web apps, complimenting Java for
+more complex ones, but has become far more widely used than Java on the web.
+
+Feedback would be highly appreciated! You can reach me at
+[@adambrenecki](https://twitter.com/adambrenecki), or
+[adam@brenecki.id.au](mailto:adam@brenecki.id.au).
+
+```javascript
+// Comments are like C. Single-line comments start with two slashes,
+/* and multiline comments start with slash-star
+   and end with star-slash */
+
+// Statements can be terminated by ;
+doStuff();
+
+// ... but they don't have to be, as semicolons are automatically inserted
+// wherever there's a newline, except in certain cases.
+doStuff()
+
+// Semicolons are a heated topic in the JavaScript world, but they're really a
+// matter of personal or style-guide preference. We'll leave them off here.
+
+/***********
+ * 1. Primitive Datatypes and Operators
+ ***********/
+
+// Javascript has one number type that covers ints and floats.
+3 // = 3
+1.5 // = 1.5
+
+// which support all the operations you'd expect.
+1 + 1 // = 2
+8 - 1 // = 7
+10 * 2 // = 20
+35 / 5 // = 7
+
+// Uneven division works how you'd expect, too.
+5 / 2 # = 2.5
+
+// Enforce precedence with parentheses
+(1 + 3) * 2 // = 8
+
+// There's also a boolean type.
+true
+false
+
+// Strings are created with ' or ".
+'abc'
+"Hello, world"
+
+// Negation uses the ! symbol
+!true // = false
+!false // = true
+
+// Equality is ==
+1 == 1 // = true
+2 == 1 // = false
+
+// Inequality is !=
+1 != 1 // = false
+2 != 1 // = true
+
+// More comparisons
+1 < 10 #=> True
+1 > 10 #=> False
+2 <= 2 #=> True
+2 >= 2 #=> True
+
+// Strings are concatenated with +
+"Hello " + "world!" // = "Hello world!"
+
+// and are compared with < and >
+"a" < "b" // = true
+
+// You can also compare strings with numbers
+"5" == 5 // = true
+
+// but this is almost always not what you want, so use === to stop this
+"5" === 5 // = false
+
+// You can access characters in a string with charAt
+"This is a string".charAt(0)
+
+// There's also a null keyword
+null // = null
+
+/***********
+ * 2. Variables and Lists
+ ***********/
+
+// variables are declared with the var keyword
+var some_var = 5
+
+// if you leave them off, you won't get an error...
+some_other_var = 10
+
+// but your variable will always end up with the global scope, even if it wasn't
+// defined there, so don't do it.
+
+/***********
+ * 3. Control Structures
+ ***********/
+
+/***********
+ * 4. Objects
+ ***********/
+```