On Tue, Sep 8, 2015 at 2:07 PM, Mark S. Miller <[email protected]> wrote: > On Tue, Sep 8, 2015 at 1:57 PM, Michael McGlothlin > <[email protected]> wrote: >> >> I try to keep it pretty simple. It's not fancy but the times you want fast >> and dirty information like this are the same times you don't want to have to >> define it manually. >> >> Symbol.identity = Symbol( 'Symbol.identity' ); >> const identity = Symbol( 'identity' ); >> var OBJECT_ID = 0; >> Object.defineProperty( Object.prototype, Symbol.identity, { >> get: () => { >> if ( !Object.hasOwnProperty.call( this, identity ) ) { >> this[ identity ] = ++OBJECT_ID; > > > Does not work on frozen objects.
Of course, it's trivial to switch it to WeakMap'ing the key. ~TJ _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
