On Tuesday, 2012-04-03 at 14:07 , David Bruant wrote:
> Le 03/04/2012 22:00, Irakli Gozalishvili a écrit : > > Here is more or less what I have in mind: https://gist.github.com/2295048 > > > > // class > > var Point = { > > (x, y) { > > this.getX = { () { return x; } } > > this.getY = { () { return x; } } > > } > > > > toString() { > > return '<' + this.getX() + ',' + this.getY() + '>'; > > } > > } > > > > > > > > > > > > Interesting new function syntax. > The prototype and function body could even be declared together. What about > 'length'? > > > Also such callable objects provide shorter alternative to current function > > syntax: > > // shorter than function > > > > numbers. > > filter({ (x) { return x % 2 } }). > > // maybe single expression can be even shorter like arrow functions ? > > map({ (x) x * x }). > > forEach({ (x) { this.add(x) } }, that); > > > > > > > > > > > > +1 > > > Also this would allow interesting APIs similar to those found in clojure: > > > > // maps / sets similar like in clojure ? > > var map = WeakMap(), key = {}, value = {}; > > > > map.set(key, value); > > map(key) // => value > > > > > > > > > > > > So far so good. > > > key(map) // => value This cannot work for backward-compat reasons. In > > ES1-5, "key = {}" creates a regular (non-callable) object. > Well I did not suggested it should be backwards compatible, also nor classes nor shorter object syntax is backwards compatible. > > And maybe built-ins could have it for doing `[]` work: > > > > > > // Maybe even non-magical replacement for `[]` > > > > [ 'a', 'b', 'c' ](1) // => 'b' > > > > > > > > > > > > Again, this is a valid ES1-5 expression and throws an error. Arrays and > function have diverging opinions on the 'length' property. > > David Also de-sugared version may be provided (and even prototyped today using __proto__): var Point = Function.create(Object.prototype, function(x, y) { this.getX = function() { return x }; this.getY = function() { return y }; }, { toString: function() { return '<' + this.getX() + ',' + this.getY() + '>' } });
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