To be fair, let a = 0; for (const record of records) { if (record.bool){ a += 1;... | Hacker News

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Tarean on Sept 9, 2017 | parent | context | favorite | on: JavaScript: The Curious Case of null >= 0

To be fair,

    let a = 0;
    for (const record of records) {
        if (record.bool){
          a += 1;
        }
    }

or

    ls.filter(x => x).length;

aren't that much harder to read. The second one probably doesn't do deforestation and would end up stupidly slow, though.

xamuel on Sept 10, 2017 [–]

For the first one, would engines like v8 be smart enough to optimize it so it isn't wasting time on a pointless if-branch? (I'd imagine not, as it would be pretty hard for the engine to know that all the record.bool's are booleans.)

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