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feat(bitwise): Function to check if a number is positive (#204)

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ADITYA
2018-09-14 00:42:42 -04:00
committed by Oleksii Trekhleb
parent 861e0e9243
commit ab7755aad7
4 changed files with 48 additions and 1 deletions
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23
src/algorithms/math/bits/README.md
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@@ -51,6 +51,29 @@ isEven: true
> See [isEven.js](isEven.js) for further details.
#### isPositive
This method determines if the number provided is positive.
It is based on the fact that all positive numbers have their last
left bit to be set to 0. However, if the number provided is zero
or negative zero, it should still return false.
```text
Number: 1 = 0b0001
isPositive: true
Number: -1 = -0b0001
isPositive: false
Number: 0 = 0b0000
isPositive: false
Number: -0 = 0b0000
isPositive: false
```
> See [isPositive.js](isPositive.js) for further details.
#### Multiply By Two
This method shifts original number by one bit to the left.