I've been attempting to perform a bitwise AND operation on long numbers using Javascript. Despite trying the solutions provided at (How to do bitwise AND in javascript on variables that are longer than 32 bit?), none of them have been accurate for the numbers I'm dealing with. To illustrate the issue, I've put together a plunker.
Plunker:http://plnkr.co/edit/awFGFKxpkmwIPpnJ06lu?p=preview
Any suggestions or assistance would be greatly appreciated.
When working with JavaScript, keep in mind that numbers are stored as 64-bit floating point values. This means that integers greater than 53 bits may not be represented accurately. To tackle this issue, one solution is to use a library that offers an alternative number representation. Once a numeric constant from the source code is converted into a number during program execution, any precision loss has already occurred.
In the provided sample code, a number requiring 60 bits is involved. As a result, the least significant bits (approximately 7) are lost, which leads to the bitwise AND operation returning zero when combined with the value of 8.
I recently came across a library called Long.js that accurately handles Long numbers.
I discovered it while researching about performing bitwise operations on large values in this thread.
To make use of the library directly in angular, I have browserified it. You can check out the updated Plunker with the browserify JS and correct answer in the Result2 textbox.
Plunker: http://plnkr.co/edit/awFGFKxpkmwIPpnJ06lu?p=preview
-Jimit
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