Quick reference to basic JavaScript commands. Search online for tutorials

Comments	// this is a one-line comment /* this comment could contain linebreaks */
Constants	numbers 12.3 and strings "hi", "hi".charAt(0) is "h"
Variables	start with a letter, then use letters, digits or _ (declared with var)
Expressions	built from +, -, *, /, pow(x,y), sqrt(), PI, E, log(), floor(), ceil(), random(), sin(), cos(), tan(), atan() and constants, variables, functions
Assignments	v = expression;
Blocks	{ statement 1; ... statement n; }
Conditions	expression == expression or <=, <, >, >=, !=... or !cond, cond1 && cond2, cond1 || cond2
if - else	if (condition) block 1 else block 2 // optional
for-loops	for (var i=start; endcondition; i++) block
while-loops	while (condition) block
Functions	f = function(v1, ..., vn) { statement 1; ... return expression; }
Lists (arrays)	a = [1,2,"hi"] a[0] is 1, a.length is 3, a+[4] is [1,2,"hi",4]
Objects (hash tables)	object = {attribute:expression, method:function} a = {x:2, y:3, s:function(){return this.x+this.y}} a.x is 3, a["x"] is 3, a.s() is 5
Output	write("Hello"); writeln(" world");