News for hackers. Stuff that matters.

A comment on NPM – "is-even", 160k weekly downloads. Parent comment

Re:NPM – "is-even", 160k weekly downloads by rezonant on Tuesday November 16, 2021 @10:16PM (#29248967)
> EDIT: I now know why they check if a string input is not an empty string, because empty strings get coerced to 0, so isFinite("") returns true.

Yes, when coerced with +:

    Number.isFinite(+'') // true
    Number.isFinite('') // false
[ Parent | on HN ]
Re:NPM – "is-even", 160k weekly downloads by jazzyjackson on Wednesday November 17, 2021 @02:51AM (#29250187)
Number.isFinite('') and Number.isNaN('') returns false, isFinite('') and isNaN('') returns true, the global versions of isFinite and isNaN first coerce their input to number, no '+' necessary.

Hence the heading "Confusing Special Case Behavior" in the mdn docs: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...

[ Parent | on HN ]
Re:NPM – "is-even", 160k weekly downloads by rezonant on Wednesday November 17, 2021 @01:05PM (#29256534)
Oh yes the global versions.
[ Parent | on HN ]