ES5's existing array extras make working with arrays a joy. However, sometimes arrays are not the right tool for the job. Perhaps you want lazy evaluation semantics (generators). Or perhaps you want to communicate that the list is immutable (compare .NET's `IEnumerable<T>` or Java's `Iterable<T>`). ES Harmony seems to have the answer: iterators! Like `IEnumerable<T>` or `Iterable<T>`, they are the most basic primitive of iteration. Yay!
But, if my `fetchAllProducts()` method returns an iterator, I don't get my array extras. Sad. --- This may be solvable in library-space, but the iterator proposal doesn't seem to have an Iterator.prototype I could extend. So we end up with unfortunate underscore-style wrappers: _(iterator).chain().map(mapper).some(predicate).value() _.some(_.map(iterator, mapper), predicate) I propose adding the array extras to any iterator (in some way), such that we can have syntax similar to the following: iterator.map(mapper).some(predicate) // returns an iterator The methods I would like to see are: * every, filter, forEach, map, reduce, reduceRight, some * Optionally: join, toString * Controversially: sorted, reversed (non-mutating versions of sort and reverse) What do you think? -Domenic _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
