The code from the Learn JavaScript the Hard Way module JavaScript Level 1 exercises. This is a mirror of the code I have in the book, so if you're struggling you can use this to compare against your attempts.
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const sleeper = (timeout) => {
return new Promise((resolve, reject) => {
setTimeout(() => resolve('DONE'), timeout);
});
}
let wait1 = sleeper(100);
wait1.then(x => console.log("Done.", x));