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async generator function: count until 5
// works in current chrome (logs from 1 to 5 every second)
function sleep(milliseconds) {
return new Promise(resolve => setTimeout(resolve, milliseconds))
async function* seconds() {
let second = 0;
while (true) {
await sleep(1000);
second += 1;
yield second;
async function example() {
for await (const second of seconds()) {
if (second === 5) break;
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