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Re: typeof null

by rauschma :: Rate this Message:

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typeof is so quirky that I’m not sure fixing it is worth the trouble. It might make more sense to introduce a new mechanism that subsumes both typeof and instanceof and also took value objects into consideration (if there is a use case for doing so). Additionally, using typeof for finding out whether a variable is declared or not seems like a separate concern to me. If that was handled via a separate operator then one could prototype improved versions of typeof via libraries (because typeof unknownVariable not throwing is something you can’t implement via a library).

Axel

On May 8, 2012, at 18:19 , Rick Waldron wrote:

Aware that that typeof null has been rejected, but I was wondering if it could be revived via the implicit "opt-in" path, eg:

non-strict, non-opt-in:

typeof null === "null"; // false

implied opt-in:

module Foo {
  export function create( options ) {

    if ( typeof options === "null" ) {
      return ... some default thing;
    }
  };
}

import create from Foo;

let default = create( null );


Is something like this even possible?

Rick

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Dr. Axel Rauschmayer


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