El 10/4/2016 5:08 PM, "Adrian Sieber" <[email protected]> escribió: > > Hi everybody, > > checking if a value is a number is currently really complicated and > I have stumbled upon a fair amount of code where this lead to bugs. > > The easiest way is `typeof value === 'number'`.
What about Number.isFinite? > This however has the drawback that `NaN` also evaluates to true. Number.isFinite(NaN) is `false` > Furthermore, basically every expression preceded by a `+` evaluates to true. > … and there are even more gotchas. For a full roundup read https://github.com/jonschlinkert/is-number. > > This implementation could also be used as a starting point. > (However, I would argue that `isNumber('3')` should evaluate to false. > It's a string after all.) > > Therefore I think a `isNumber` functionality should already be provided natively. > What do you think? > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss >
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