In Javascript, when adding to a Uint32Array, the operation of 0x100000000 >>> 0 actually performs a bitwise zero-fill right shift by 0 bits

After recently posting my first question on Stack Overflow (see For loop inside another for loop crashes in Javascript), I received a helpful answer from Ry- that seems to have solved my issue. However, as I dug into the code to understand how it works, I came across the perplexing statement "0x100000000 >>> 0".

My understanding of bitwise operators was recently acquired - the triple greater-than sign (>>>) shifts bits to the right by adding zeros at the leftmost end while dropping bits off from the right. So, shouldn't ">>> 0" technically have no impact on the equation?

Strangely enough, when I tried removing the bitwise operator from the code, it stopped functioning properly. Can someone shed light on why this is the case?

const world = document.getElementById('canvas');
const context = world.getContext('2d');

const start = performance.now();

const {width, height} = world;
const random32 = new Uint32Array(width * height);

for (let i = 0; i < random32.length; i++) {

    //THIS IS WHERE MY CONFUSION LIES
    random32[i] = Math.random() * 0x100000000 >>> 0;

}

Even though I thought removing ">>> 0" wouldn't make a difference, the code won't run without it.

I've been delving deeper into bitwise operators and Uint32Arrays but haven't found an explanation yet.

Answer №1

When it comes to JavaScript, floats and integers are not distinguished. However, there are certain operations that do make a difference. For instance, the >>> operation falls into this category. If you multiply Math.random() * 0x100000000, you will get a float ranging from 0 to 0x100000000. But when you use the >>> operator, it coerces the result into a positive integer because >>> only works with integers. And then it shifts that integer by zero digits, essentially doing nothing.

In simple terms: using x >>> 0 on non-negative numbers is equivalent to using x|0 or Math.floor(x).

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