A sleep utility function can be useful in a variety of situations. From
testing and debugging to simulating a delay in development.
Here is what that function can look like in its simplest form:
function sleep(time) {
return new Promise((resolve) => {
setTimeout(resolve, time)
})
}This function returns a promise that will resolve after the given number of milliseconds.
As an example of how to use it, here is how we can simulate a delay in a fake fetch function.
async function fakeUserFetch(userId) {
# add half a second of "network" latency
await sleep(500)
const fakeResponse = {
id: userId,
email: "fake-email@example.com"
}
return Promise.resolve(fakeResponse)
}