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Creating Promises - Asynchronous JavaScript | JavaScript | Repovive

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JavaScript22 sections · 783 units18h total

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Creating Promises

Make your own promises

Create a Promise with the new Promise() constructor. It takes a function with resolve and reject parameters.

const wait = new Promise((resolve, reject) => {
  setTimeout(() => {
    resolve("Done!");
  }, 1000);
});

wait.then(result => console.log(result));

Call resolve(value) on success, reject(error) on failure.