> Maybe I am confused. Here is what I was imagining:
> var w = 1; // w is declared and defined. typeof gives 'number'
> var x; // x is declared, but is undefined. typeof gives 'undefined'
> y = 4; // y is not declared, is a global. typeof gives 'number'
> // z is not declared typeof gives 'undefined.
>
> So how can I check to see that y and z are not declared?
>
> In:
> var b;
> if (typeof x !== 'undefined') b = x
>
> I don't get a ReferenceError. What I am I missing?
Not a frequent use case (again, even less frequent with modules in ES6), but it
exists: Boilerplate to Node.js-enable an asynchronous module definition.
({ define: typeof define === "function"
? define // browser
: function(F) { F(require,exports,module) } }). // Node.js
define(function (require, exports, module) {
// Node.js module code goes here
});
Alternative: wrap a function around define(), make define a parameter, perform
the (same!) check when immediately-invoking the function.
--
Dr. Axel Rauschmayer
[email protected]
home: rauschma.de
twitter: twitter.com/rauschma
blog: 2ality.com
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