Unless I'm misunderstanding what you are looking for, I believe the current proposal accounts for this as `::arr.push` with no expression before the `::`.
Logan On Tue, Mar 7, 2017 at 4:33 PM, Augusto Moura <[email protected]> wrote: > Before I open any suggestion for my ideia in the [bind-operator](// > github.com/tc39/proposal-bind-operator) proposal, I like to know you > guys' opinion about, and if even it is in the scope of the current proposal. > > There are moments when we want to export instances methods binded with > their objects, like `num.toFixed.bind (num)`, most of the time to be used > as high order functions. With the current proposal the best we can get is > `num::num.toFixed`, what seems a bit weird and counterintuitive. > > For example, let's say that for an unknow reason we want to copy a array > to another using the `push` method. There are a few ways: > ``` .javascript > const unary = fun => a => fun(a); > const arr = []; > > > // With arrow functions > [1, 2, 3, 4].map(n => arr.push(n)); > > > // With binding > [1, 2, 3].map(unary(arr.push.bind(arr))); > ``` > > And again, the best way of doing this with the current proposal is > something like: > ``` .javascript > [1, 2, 3].map(unary(arr::arr.push)); > ``` > > My idea, similar to double colon operator in Java 8, is that the > expression `foo::bar` translates to: access `bar` in `foo`, if it is a > function, returns the function binded to foo. > > So: > ``` .javascript > // The two expressions below produce the same function > foo::bar; > foo.bar.bind(foo); > > // So in our example instead of using something like > [1, 2, 3].map(arr::arr.push); > // we can use > [1, 2, 3].map(arr::push); > ``` > > And yeah, it just decreases one word. However imagine the symbol as > acessor instead of a operator, leaves the things really less confusing in > my opinion. > > It can be useful for React applications too: > ```.javascript > class Button extends React.Component { > alertText() { > alert(this.props.text); > } > > render() { > // Instead of `this::this.alertText` > return <button onClick={this::alertText} />; > } > } > ``` > > Imo, my idea has a different motivation e use case than the current > proposal and because of that, needs to be splitted with the original. We > can discuss other symbols than the `::`, but I personally think that it > fits perfectly and make some neat code when composing high order functions. > > -- > Augusto B. Moura > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > >
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