js-coroutines gives your code: data indexing and lookup functionality, in idle time

Following user feedback I've added some key "lodash" like functions to the out of the box features of js-coroutines.

I've added keyByAsync groupByAsync, includesAsync, uniqueByAsync. Here are all of the "out of the box" functions now available. They all work asynchronously, spreading the load over multiple frames to ensure that your app stays interactive.

You can now execute code like this:

     const response = await fetch("some/url")     const data = await parseAsync(response.text())     const index = await keyByAsync(data, v=>v.id)     const groups = await groupByAsync(data, v=>v.category)

Of course, you can also write your own generator functions to split up any kind of processing you might need to do - and all of these functions work with the new pipe() to create functional pipelines that don't hog the main thread.

     const process = pipe(       decompressAsync,       parseAsync,       keyByAsync.with(v=>v.id)     )

Another new feature is support for "collections" where we can use objects with key value pairs as well as arrays with all of the key functions that make sense (in the table above these are shown as handling 'collection' parameters).