CODEWITHSUNDEEP
javascriptnode.js
Michael Dillon
Michael Dillon

Reputation: 32392

Why can't I get an object prototype name in node.js

When I run the following code:

var os = require('os');
var sys= require('sys');

var ostype = os.type() + " ";
sys.puts(ostype.prototype.toString());
sys.puts("\n");

I get the following error:

node.js:116
        throw e; // process.nextTick error, or 'error' event on first tick
        ^
TypeError: Cannot call method 'toString' of undefined
    at Object.<anonymous> (/home/Maria Dillon/test.js:5:27)
    at Module._compile (module.js:374:26)
    at Object..js (module.js:380:10)
    at Module.load (module.js:306:31)
    at Function._load (module.js:272:10)
    at Array.<anonymous> (module.js:393:10)
    at EventEmitter._tickCallback (node.js:108:26)

If I understand 15.2.4.2 of ECMA-262 3rd edition, this should work.

PS I am running node.js 0.5.0pre which I built myself on Cygwin.

Upvotes: 2

Views: 2606

Answers (1)

Gonzalo Larralde
Gonzalo Larralde

Reputation: 3541

Because ostype is an string, which is a primitive value. Here you'll find more information about it.

Good luck!

Upvotes: 3

Related Questions