What happens if we define a property inside a function using : operator?

Question

In the code below, I added a new property to the function obj1. However, when I print the value of obj1.name, it shows nothing, just blank!

Well, if what I am doing is wrong then the JavaScript engine has to complain, but it does not. So what is going on here?

var obj1 = function (){
    name:"john";
};


console.log(obj1.name);// prints nothing!

here are the errors I get when I pasted your code: `Line 2: Label 'name' on john statement.` `Line 2: Expected an assignment or function call and instead saw an expression.` — omarjmh, Apr 13 '16 at 01:05

score 1 · Accepted Answer · answered Apr 13 '16 at 01:06

name: token here is parsed as a label.

So it's a syntactically valid script that:

So, obj1.name is still undefined since you haven't set its properties anywhere.

References:

1 Answers1