basic outline for javascript

Author: James Halliday

javascript.markdown

@@ -1,12 +1,255 @@
 # javascript
 
+javascript is a programming language
+you can use to program web pages
+and command-line tools and servers
+
 ---
 
-# links
+# install node
 
-http://jsforcats.com/
+We'll be using node on the command-line to learn javascript.
+
+Download and install node from:
+
+https://nodejs.org
+
+---
+
+# write a program
+
+Now let's make a program. Put this text into a file called robot.js:
+
+``` js
+console.log('BEEP BOOP')
+```
+
+---
+
+# run a program
+
+Now use `node` to run your program:
+
+```
+$ node robot.js
+BEEP BOOP
+```
+
+---
+
+# recap: console.log
+
+`console.log(...)` is a function that prints its arguments to
+stdout followed by a newline (`\n`) character
+
+---
+
+# recap: 'BEEP BOOP'
+
+* `'BEEP BOOP'` is a string.
+* `'BEEP BOOP'` is an argument to the `console.log()` function.
+
+Note the single quotes on each side.
+
+You can use double quotes too: `"BEEP BOOP"`
+
+Sometimes an "argument" is called a "parameter".
+
+---
+
+# statements
+
+In the previous program, we had a single statement.
+You can have multiple statements, each on their own line:
+
+``` js
+console.log('Such')
+console.log('wow.')
+```
+
+Now save this code to a file `suchwow.js` and run it with `node`:
+
+```
+$ node suchwow.js
+Such
+wow.
+```
+
+---
+
+# statements
+
+You might also see programs that use semicolons to separate
+statements:
+
+``` js
+console.log('Such');
+console.log('wow.');
+```
+
+Semicolons are optional. There are some cases where they are
+necessary, but this is rare in practice.
+
+Both including and omitting semicolons are popular code styles.
+
+---
+
+# variables
+
+Another kind of statement is a variable declaration:
+
+``` js
+var x = 5
+var y = 111
+console.log(x * y)
+
+var a = 'beep'
+var b = 'boop'
+console.log(a + b)
+```
+
+which prints:
+
+```
+$ node vars.js
+555
+beepboop
+```
+
+---
+
+# variables
+
+Variables are containers that can hold values.
+
+Strings like `'beep'` and numbers like `5` are values.
+
+---
+
+# operators
+
+We used the `*` operator to multiply two numbers.
+
+Here are some other operators you can try with numbers:
+
+* `+` - add
+* `-` - subtract
+* `*` - multiply
+* `/` - divide
+* `%` - modulo (the remainder after division)
+
+modulo is really handy when you need a value to "wrap around"
+
+---
+
+# assignment updates
+
+You can change the value stored in a variable at any time by
+assigning a new value.
+
+``` js
+var x = 5;
+x = x + 10;
+console.log(x);
+```
+
+which prints `15`:
+
+```
+$ node x.js
+15
+```
+
+---
+
+# assignment operators
+
+There is a shorthand for running an operator and saving the
+result back to a variable. Instead of `x = x + 10` we can do
+`x += 10` instead:
+
+``` js
+var x = 5
+x += 10
+console.log(x)
+```
+
+Just take one of the arithmetic operators from earlier and add an
+`=` at the end to do an update "in place":
+
+* `+=` - add in place
+* `-=` - subtract in place
+* `*=` - multiply in place
+* `/=` - divide in place
+* `%=` - modulo in place
+
+---
+
+# increment, decrement
+
+There are two other operators for convenience:
+
+* `x++` - increment x by 1 in place
+Same as: `x += 1` or `x = x + 1`
+
+* `x--` - decrement x by 1 in place
+Same as: `x += 1` or `x = x + 1`
+
+---
+
+---
+
+---
+
+# arrays
+
+---
+
+# 
+
+---
+
+# objects
+
+We've already been using some objects:
+
+* `process` is an object with a property `argv` that is an array.
+* `console` is an object with a property `log` that is a function.
+
+---
+
+# functions
+
+
+
+---
+
+# builtins
+
+
+
+---
+
+# while loop
+
+---
+
+# for loop
+
+---
 
 # homework
 
+Your homework is to get through the `javascripting` lesson on
+nodeschool:
+
 http://nodeschool.io/#javascripting
 
+---
+
+# links
+
+http://jsforcats.com/
+
+---
+