Constructor property of Java Script types

Question

I'm leaning JavaScript and I've read about the constructor property.

I tried

And they all worked. However to my surprise when trying:

They did not, why is that?

Try `123..constructor`, the first '.' is a decimal mark. `{}.constructor` works for me. — Korikulum, Jun 01 '14 at 14:33
@Korikulum where? That's a syntax error in the chrome dev tools. It [depends on where you're running it](http://stackoverflow.com/questions/17268468/why-is-nan-only-on-the-client-side-why-not-in-node-js/17269376#17269376). — Benjamin Gruenbaum, Jun 01 '14 at 14:36
Suggest what? You haven't told us what you are trying to do. — JLRishe, Jun 01 '14 at 14:36
@BenjaminGruenbaum Yes, you're right, I was doing the following: `console.dir({}.constructor);`, and that works. — Korikulum, Jun 01 '14 at 14:39

score 2 · Accepted Answer · answered Jun 01 '14 at 14:33

This is a parse issue.

When you do 123.constructor the engine experts a decimal after the 123 like 123.123
When you do {}.constructor the engine reads {} as an empty block and then reads . as the first thing in the outer block which is meaningless.

Both of which can be fixed by wrapping these with ()s

(123).constructor; // Number, note this 'boxes'
({}).constructor; // Object

1 Answers1