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re: A Tale of Two Functions VIEW POST

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re: Nice and concise! rxjs looks great, I should give it a look.
 

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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