Variable scope proposal for candor language

candor_variable_test.js

// All variables MUST be initially declared using a keyword.
// Let's use "var"

var g = "global"
h = "bad" // ReferenceError, cannot find undeclared variable "h"

foo() {
  var b;
  console.log(a) // ReferenceError, cannot find undeclared variable "a"
  console.log(b) // "nil", undeclared variables default to nil (since candor doesn't do undefined right?)
}
foo();

bar(c, d) {
  console.log(c) // "one", function arguments are implicitly declared in the scope of the function

  var e = "two"
  var baz = () {
    console.log(d); // "two", lexical closure scoping
    console.log(e); // "three", lexical closure scoping
    console.log(g); // "global", lexical closure scoping works up to the global level
  }
  baz()

  foo()       // function statements implicitly declare variable in the appropriate scope
  foo = "foo" // function vars can be overwritten just like normal
}
bar("one", "two")

testGlobal() {
  g = "test" // works on declared global variable referenced through closure scope
  console.log(g)    // "test", changed value
}
testGlobal()
console.log(g)      // "test", changed global value in testGlobal function

var g2 = "global"
testGlobal2() {
  var g2 = "test global" // local variable shadows global
  console.log(g2)        // "test"
}
testGlobal2()
console.log(g2)          // "global", unchanged