Nice and concise! rxjs looks great, I should give it a look.
It's definitely nice if you have to do js. Since you're already using F#, elmish is probably the best option overall :) They can also be mixed at runtime.
All signs keep pointing here. Guess I gotta go :)
Was thinking, the most concise version of this just exploits the ascii table to eliminate most of the checks. And also probably fails code review:
reduce(([previous, result], val: string) =>
previous !== result &&
(Math.abs(previous.charCodeAt(0) - val.charCodeAt(0))) === 0x20
? [result.charAt(result.length - 2), result.slice(0, result.length - 1)]
: [val, result + val]
, ['', '']),
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