On Sun, Jan 18, 2015 at 4:28 AM, Axel Rauschmayer <[email protected]> wrote:
> Currently the keys of the entries returned by `Set.prototype.entries()` > are the same as the values: > > ```js > let set = new Set(['a', 'b']); > > let pairs = [...set.entries()]; > console.log(JSON.stringify(pairs)); // [["a","a"],["b","b”]] > ``` > To begin with: `.entries()` doesn't make much sense in Sets abstraction at all (as well as `.keys()`). But the ship was sailed. Sets are just a sugar on top of maps in ES6 (with just renamed API methods). > > Given that sets are ordered, I’d use the “position” of an entry as the > key: [[0,"a"],[1,"b”]] > This notation would assume that a set may have non-unique values (e.g. "a" at index 0, and "a" at index 2), and in this case it wouldn't be a set anymore. > > Rationale: First, having an indices as keys makes the entries more useful. > Second, destructuring already treats entries as if they had indices: > > ```js > let [x,y] = set; // x='a'; y='b’; > ``` > Would this work actually? :) Destructuring does get property, which wouldn't call set's `get` method. Dmitry
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