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example.mjs
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example.mjs
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import { buildRocket, fetchCrew, getFuel, bookLaunchPad } from './index.mjs';
const initMission = () => Promise.all([
buildRocket(),
fetchCrew(),
getFuel(),
bookLaunchPad(),
]);
const getReadyForLaunch = ([rocket, crew, fuel, launchPad]) => (
launchPad.addRocket(rocket)
.then(() => rocket.addCrew(crew))
.then(() => rocket.addFuel(fuel))
.then(() => rocket)
);
const launch = rocket => new Promise((resolve, reject) => {
const fire = () => {
if (rocket.altitude < 100) {
return rocket.fireEngine(0).then(fire, reject);
}
if (rocket.altitude < 400 && rocket.engineIsFiring(0)) {
return rocket.stopEngine(0)
.then(() => rocket.runStageSeparation(0))
.then(fire, reject);
}
if (rocket.altitude < 400) {
return rocket.fireEngine(1).then(fire, reject);
}
return rocket.stopEngine(1)
.then(() => rocket.runStageSeparation(1))
.then(resolve, reject);
};
fire();
});
export const run = () => {
const start = Date.now();
return initMission()
.then(getReadyForLaunch)
.then(launch)
.then(() => {
console.log(`Total time: ${Math.floor((Date.now() - start) / 1000)} secs`);
});
};
if (typeof process !== 'undefined' && process.env.NODE_ENV !== 'test') {
run()
.catch((err) => {
if (err) {
console.error(err);
process.exit(1);
}
});
}