Thanks, good to survey again -- we did when considering bind for ES5 (then 3.1 IIRC). Andrew Dupont's JSConf.us 2011 talk covered the particular Prototype history too.
http://blip.tv/jsconf/jsconf2011-andrew-dupont-everything-is-permitted-extending-built-ins-5211542 /be On Jan 8, 2012, at 9:22 PM, John-David Dalton wrote: > Just a bit of back story on Function#bind because I think it's good to know. > Prototype's Function#bind was based on the 2004 post "Object-Oriented > Event Listening through Partial Application in JavaScript" by Daniel > Brockman: > http://web.archive.org/web/20100901172230/http://brockman.se/2004/method-references/ > > There was no de-facto standard of Function#bind. ExtJS, PrototypeJS, > MooTools, Dojo, and jQuery each had their own implementations. > > MooTools Function#bind used to be implemented like: > function fn() { > console.log([].slice.call(arguments)); > } > var f = fn.bind({}, ['a', 'b']); // notice an array of arguments > f('c'); // ['a', 'b'] // ignored arguments passed to the bound function > > Ext's implementation is completely different: > http://www.sencha.com/learn/legacy/Manual:Utilities:Function#createDelegate > > Even though Dojo and jQuery implementations don't extend > Function.prototype they follow Prototype's implementation with the > exception that they also allow passing a string instead of a function > and jQuery adds a `guid` property to the bound function. > http://dojotoolkit.org/api/dojo.hitch > http://api.jquery.com/jQuery.proxy/#example-1 > > Prototype 1.7's Function#bind (which overwrites native bind too) isn't > as ES5 compliant as it could be because its bound function doesn't > behave correctly when called as part of a new expression. > > function Foo(a,b,c) { > this.a = a; > this.b = b; > this.c = c; > } > var Bound = Foo.bind({}, 1, 2); > var b = new Bound(3); > console.log(Object.keys(b)); // [], but should be ['a', 'b', 'c'] > console.log(b.c) // undefined, but should be 3 > > - JDD > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss
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