node prints undefined after console.log() with a javascript dictionary

Question

I am test JavaScript dictionary on node console as follows

$ node
> var dict = {};
undefined
> dict["t"] = "table";
'table'
> console.log(dict);
{ t: 'table' }
undefined
> dict["f"] = "field";
'field'
> console.log(dict);
{ t: 'table', f: 'field' }
undefined
> console.log(dict.t);
table
undefined
> console.log(dict.f);
field
undefined
> console.log(dict['f']);
field
undefined
> var str = "f";
undefined
> console.log(dict[str]);
field
undefined

The dictionary works fine but what are those "undefined" mean? What did I miss here?

Thanks,

The console prints out the value of the last expression evaluated. console.log() returns undefined, and similarly a var declaration results in undefined. — Pointy
– Pointy, Commented Apr 3, 2016 at 23:21
I guess that since it's a statement and not specifically an expression statement, the value is undefined — Pointy
– Pointy, Commented Apr 4, 2016 at 4:33

Nickolay · Accepted Answer · 2016-04-04 00:00:34Z

2

This comment should really have been an answer:

The console prints out the value of the last expression evaluated. console.log() returns undefined, and similarly a var declaration results in undefined. – Pointy

answered Apr 4, 2016 at 0:00

community wiki

Nickolay

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2 Comments

Shawn Over a year ago

So the undefined does not indicate any error and I do not have to try and get rid of the "undefined"?

Pointy Over a year ago

@Shawn right - nothing's wrong with your code. It's just the console doing its thing.

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