Learn ECMAScript - Second Edition

The optimized fix

Why not combine the good parts of atomics and the good parts of the speed of local variables sitting in the CPU register? Here we are:

// worker.jslet sharedMem;addEventListener('message', ({data}) => {  //console.log(data);    if(data.message == 'sab') {        sharedMem = data.memory;        console.log('Memory ready');    }    if(data.cmd == 'start') {      console.log('Iterations ready');        startCounting(data.iterations);    }});function startCounting(limit) {    const arr = new Uint32Array(sharedMem);    let count = 0;    for(let i=0;i<limit;i++) {        count += 1;    }    Atomics.add(arr, 0, count);    postMessage('done')}

Here, from our last implementation, we took Atomics.add out of the loop to avoid calling it a billion times. Instead, we performed the work assigned to ...