On Sat, Mar 9, 2019 at 11:10 AM Felipe Nascimento de Moura <[email protected]> wrote: > > Personally, I don't think it would be THAT useful... > but...I think there is something behind this proposal that makes sense. > > I do believe it could be useful for developers to have an easier access to > number parts or characteristics. > Perhaps something like: > > const i = 1234.567;
Can you provide a scenario in which these would do something useful, such that it would be worth adding them over just using the math operations that already exist? > console.log( i.float ); // 567 i % 1 (If you really wanted this as an integer, it's not well-founded; .567 isn't exactly representable as a double, so JS doesn't know that you "meant" it to have only three digits after the decimal point, and thus want 567 as the answer. You'll instead get some very very large integer that *starts with* 567, followed by a bunch of zeros, followed by some randomish digits at the end.) > console.log( i.abs ); // 1234 Math.trunc(i) > console.log( i.thousands ); // 1 Math.trunc(i / 1000) > console.log( i.million ); // 0 Math.trunc(i / 1e6) > console.log( i.hundred ); // 2 Math.trunc(i / 100) % 10 > console.log( i.hundreds ); // 12 Math.trunc(i / 100) > console.log( i.ten ); // 2 Math.trunc(i / 10) % 10 > console.log( i.tens ); // 123 Math.trunc(i / 10) > console.log( i.tenth ); // 5 Math.trunc(i % 1 * 10) % 10 > console.log( i.tenths ); // 5 Math.trunc(i % 1 * 10) > console.log( i.hundredth ); // 6 Math.trunc(i % 1 * 100) % 10 > console.log( i.hundredths ); // 56 Math.trunc(i % 1 * 100) Some of these are easy to remember and use; others take some thinking to deploy. But the question is still "what would someone use this information for?", such that the benefit to developers is worth the cost to all parties involved (spec writers, implementors, testers, and then developers having to navigate a larger stdlib). ~TJ _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
