Can global constants be declared in JavaScript?

Question

If so, what is the syntax for such a declaration?

Answer 1

As "Pointy" so carefully notes, ECMAscript has no such feature. However, JavaScript does:

const a = 7;
document.writeln("a is " + a + ".");

Of course, if you're writing code to put on the web to run in web browsers, this might not help you much. :-)