Is it possible to shift an unsigned number by 7 bits in JavaScript? I am trying to shift the number 1479636484000 to the right.
Both
1479636484000 >> 7
and
1479636484000 >>> 7
are returning incorrect answers for me. The expected result should be 11559660031. I suspect there may be a sign bit issue or that the number is too large to be supported. Is there a clever workaround for this problem?
When working with bitwise operations in JavaScript, the first step is truncating the number to a 32-bit integer. If your numbers are too large, one workaround is crafting your own numeric library to handle them.
It's worth mentioning that by dividing floating-point numbers by 128 and discarding the fraction, you can achieve the correct result.
If you have a string containing a number, one approach is to eliminate the last 7 characters and then convert it back into a numerical value.
console.log((1479636484000).toString(2));
console.log((11559660031).toString(2));
console.log((1479636484000).toString(2).slice(0, -7));
console.log(parseInt((1479636484000).toString(2).slice(0, -7), 2));To perform bitwise shifting on values greater than 32 signed bits in JavaScript, you must make use of BigInt data type.
let x = Number(BigInt(1479636484000) >> 7n);
let y = Number(BigInt(1479636484000) >>> 7n);
This is essential because JavaScript employs a 64-bit floating point number format, which restricts the precision of integers to 32 bits during calculations.
For instance, attempting to shift the code let z = 1 << 32 will yield the value 1. However, 1 << 31 will produce -2147483648, or 0x80000000.
Dealing with 64-bit integers and bit shifting in JavaScript can be complex, but constraints like these contribute to why some view JavaScript as a challenging language to work with.
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