ECMAScript Cookbook

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It's possible to refactor the main function so that the pre-check functions are executed implicitly. We can use the Array.prototype.map function to do this:

 export async function main() { 
  const prelaunchChecks = [ 
    checkEngines, 
    checkFlightPlan, 
    checkNavigationSystem 
  ]; 
  const checkResults = await Promise.all(prelaunchChecks.map((check) =>   check()); 
  const readyToLaunch = checkResults.reduce((acc, curr) => acc &&   curr); 
 
  if (readyToLaunch) { 
    console.log('All systems go, ready to launch: '); 
  } else { 
    console.error('Something went wrong, abort the launch: '); 
  } 
 

The highlighted section shows that the asynchronous functions are ...