function slowFunction(message) {
return new Promise((resolve, reject) => {
setTimeout(() => {
resolve("DONE: " + message);
}, 3000)
});
}
// All
Promise.all([slowFunction("Alice"), slowFunction("Bob"), slowFunction("Charlie")])
.then((res) => {
console.log(res);
});
// Sequential
slowFunction("Alice")
.then((res) => {
console.log(res);
return slowFunction("Bob");
})
.then((res) => {
console.log(res);
return slowFunction("Charlie");
}).then((res) => {
console.log(res);
});
now, using async await
async function slowFunction2(message) {
let myPromise = new Promise((resolve, reject) => {
setTimeout(() => {
resolve("DONE: " + message);
}, 3000)
});
let result = await myPromise;
return result;
}
// Sequential
console.log(await slowFunction("W"));
console.log(await slowFunction("X"));
console.log(await slowFunction2("Y"));
console.log(await slowFunction2("Z"));
console.log("done sequence");
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