Expose helpers for pos.join('|') and chunkKey.split('|') so no one needs to do this manually

[kumavis]

from #9
Complete encapsulation of the pos.join('|') part inside the voxel library. Nobody outside should need know how to create hash keys for chunks, so the algorithm can be switched to a better one later.

[deathcap]

Also worth noting, ES6 now has a Map data type (can be polyfilled: https://www.npmjs.com/package/es6-map) accepting arbitrary keys, not only strings as with object (which necessitated chunkIndex.join('|')). This would let the browser choose the hashing algorithm or other hash table or data structure implementation details, which only have to "on average, provide access times that are sublinear on the number of elements in the collection"

[kumavis]

is there a hook to process the keys? seems like map[ [1,2,3] ] !== map[ [1,2,3] ] b/c [1,2,3] !== [1,2,3]

[deathcap]

> m=new Map()
Map {}
> m
Map {}
> m.set([1,2,3], "foo")
Map {[1, 2, 3] => "foo"}
> m.get([1,2,3])
undefined
> k=[1,2,3]
[1, 2, 3]
> m.set(k, "foo")
Map {[1, 2, 3] => "foo", [1, 2, 3] => "foo"}
> m.get(k)
"foo"

Compared by object equality… I guess we would still need a hashing algorithm (or pos.join('|')); ES6 Map might not buy us much here after all.

http://people.mozilla.org/%7Ejorendorff/es6-draft.html#sec-map-objects