>
> 1) Can someone tell me what a sha (sp?) dictionary is?
Sha -> Hash. In the video those were Sha1 hashes.
Dictionary -> JavaScript Object
Example:
{ '3b9e33965edbaf4094947aca1b8d59eacfd2ef47': { usefulInfo:123 },
'98cbccef9dd0f6f70a48baf03fdfb98fb0f70b4f': { moreInfo: 456 } }
2) It seems this would mainly be useful as a teaching tool because I don't
> see how it could work with non-deterministic behavior such as io events.
Yes, mainly useful for teaching/learning purposes, but not really because
of io events. Once something happens it, it happened. The data-structures
are immutable. When you go backward what has already happened won't
change. However, when you go forward again you will potentially fork the
computation tree (if going forward has a different side effect than
previously).
Example:
var x = Math.random()
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