As reported in the title:
Why in Javascript -1 * 0 = -0 ?
How I can prevent it?
I would have expected to have 0 as result.
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gixlg
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2What is the problem ? – thibsc May 28 '20 at 21:13
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What do you want to happen instead? – VLAZ May 28 '20 at 21:13
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1Why do you want to prevent it? Is it causing any problems in your program's logic? – John Montgomery May 28 '20 at 21:13
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If you don't want negative values use `Math.abs`. – Marco May 28 '20 at 21:13
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"*I would have expected to have `0` as result.*" OK but I don't get where the problem with a negative zero is. What specific issue is it causing? – VLAZ May 28 '20 at 21:19
1 Answers
1
Do you have a specific reason for wanting to prevent that?
If your concern is related to the fact that you want to get 0 instead of -0 you don't need to worry about that since -0 === 0 return true
console.log(-1 * 0)
console.log(-1 * 0 === 0)
const turnItToNegative = n => -1 * n
const myNumber = turnItToNegative(0)
if (myNumber === 0) {
console.log('This is still zero, don\'t worry')
}
Mestre San
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@gixlg Are you actually getting an unexpected result (outside of the console)? If so, show the code that's producing the unexpected result. If not, then you're worrying about nothing. – John Montgomery May 28 '20 at 21:25
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Ya, the only time you'd have an issue is if you need to differentiate between -0 and 0. But you'd know it if you needed it. – user120242 May 28 '20 at 21:30