theme(s) / editor / tutorial(s)


quick reference to basic javascript commands.
search online for more tutorials. See also:
All these packages have been used with gratitude, see theme(s). They were originally developed by Peter Jipsen, November 2010, Chapman University.

Comments 
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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");