Issue-#4: Add Support for saving state

[daxbert]

Here are the changes to support saving state in TDigest.

I'm not very familiar with javascript unit testing. Would appreciate any guidance you may have.

[daxbert]

note: I didn't bump the version as I wasn't sure what you'd prefer.

[welch]

Thanks for the PR!

I'm going to be swamped for a few days before I'll get
a close look at it. But it seems more complicated than
need be. I believe you can capture the needed state by
just dumping the centroids using toArray, and restore it
by calling push_centroid on each item in order (no compression
will be triggered). Let me know what you think.

[daxbert]

Ah, I'll give that a try. If it gives the same results I'll cancel the
PR.

On Jul 18, 2016 11:51 PM, "Will Welch" notifications@github.com wrote:

Thanks for the PR!

I'm going to be swamped for a few days before I'll get
a close look at it. But it seems more complicated than
need be. I believe you can capture the needed state by
just dumping the centroids using toArray, and restore it
by calling push_centroid on each item in order (no compression
will be triggered). Let me know what you think.

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