==========================================
regexes
==========================================

theFunction(/regex1/, /regex2/g);

---

(program (expression_statement
  (function_call (identifier) (arguments (regex) (regex)))))

==========================================
numbers
==========================================

theFunction(100.0, 200);

---

(program (expression_statement
  (function_call (identifier) (arguments (number) (number)))))

==========================================
strings
==========================================

theFunction('', "", 'single-quoted-string', "double-quoted-string");

---

(program (expression_statement
  (function_call (identifier)
    (arguments (string) (string) (string) (string)))))

==========================================
function expressions
==========================================

var x = {
  theMethod: function(argA, argB) {
    var x = argA;
  }
};

---

(program
  (var_declaration (var_assignment
    (identifier)
    (object (pair (identifier) (function_expression
      (formal_parameters (identifier) (identifier))
      (statement_block
        (var_declaration (var_assignment (identifier) (identifier))))))))))

==========================================
comments
==========================================

// this is the beginning of the script.
// here we go.
var thing = {

  // this is a property.
  // its value is a function.
  key: function(x /* this is a parameter */) {

    // this is a statement
    doStuff();
  }
};

---

(program
  (comment)
  (comment)
  (var_declaration (var_assignment
    (identifier)
    (object
      (comment)
      (comment)
      (pair (identifier) (function_expression
        (formal_parameters (identifier) (comment))
        (statement_block
          (comment)
          (expression_statement (function_call (identifier))))))))))

==========================================
comments within expressions
==========================================

y // comment
  * z;

---

(program (expression_statement
  (math_op (expression (identifier) (comment)) (identifier))))