One advantage of this approach is that more "spec magic" can be implemented in terms of the language - it would also make subclassed arrays more versatile instead of having to always be a Proxy.
On Thu, Apr 9, 2015 at 11:35 AM, Axel Rauschmayer <a...@rauschma.de> wrote: > Proxies should be enough for this. Is there any reason not to use them? > > On 09 Apr 2015, at 20:31, Kos Ddsky <kos...@gmail.com> wrote: > > ( note: you can view this message as a gist @ > https://gist.github.com/kosich/375da99403c76bc75bbd ) > > Currently we can imitate Arrays only with objects, where we would refer to a > value at some position via referring to objects property ( with integer index > being converted to a string ) > > ```js > var arr = { > "0" : "zero", > "1" : "one" > }; > > arr[ 1 ]; > ``` > But we wouldn't get all those features that original Array has (like length > autoincremention, splice, split etc.) > > So, the suggestion is to have WKS for getting and setting item in array by > index. > > ```js > get [ Symbol.Array.item ] ( index ){ /*returning code here*/ } > set [ Symbol.Array.item ] ( index ){ /*setter code here*/ } > ``` > > -or- > > ```js > [ Symbol.Array.get ] ( index ){ /*returning code here*/ } > [ Symbol.Array.set ] ( index ){ /*setter code here*/ } > ``` > > ## Possible usecases > > ### readonly array > will throw if user tries to set item directly via index > ```js > class ROArray extends Array { > > constructor( initialValues ){ > // init the array values here > } > > [ Symbol.Array.set ] ( index ){ > throw 'can`t set'; > } > > [ Symbol.Array.get ] ( index ){ > return this[ index ]; > } > > } > ``` > > ### template-like behavior > items getter will wrap the value into a tag > ```js > class LITemplateArray extends Array { > > set tag ( tag ){ > this._tag = tag; > } > > [ Symbol.Array.get ] ( index ){ > var tag = this._tag || 'li', > value = this[ index ]; > > return `<${ tag }>${value}</${tag}>`; > } > > } > ``` > > /*this is my first thread here, so I'm sorry if being wrong somewhere*/ > /*after googling around, I haven't found such suggestion. though could easily > miss that*/ > > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss > > > -- > Dr. Axel Rauschmayer > a...@rauschma.de > rauschma.de > > > > > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss > >
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