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File: Lecture 7 Backend
backend development swe 432 fall 2019 web application development review async programming example go get a go get a go get a go get a go get a candy bar ...

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  Backend Development
            SWE 432, Fall 2019
         Web Application Development
         Review: Async Programming Example
         Go get a           Go get a           Go get a           Go get a          Go get a 
         candy bar         candy bar          candy bar          candy bar         candy bar
         Go get a           Go get a           Go get a           Go get a          Go get a 
   1 second eachcandy bar  candy bar          candy bar          candy bar         candy bar
                                            thenCombine
      Group all Twix       Group all 3         Group all          Group all          Group all 
                          Musketeers           MilkyWay        MilkyWay Dark         Snickers
   2 seconds each                             when done
                                              Eat all the 
                                                 Twix
                                                Explain 
                                               example
 LaToza                                     GMU SWE 432 Fall 2019                                    !2
             Review: Async/Await
       • Rules of the road: 
           • You can only call await from a function that is 
              async 
           • You can only await on functions that return a 
              Promise
           • Beware: await makes your code synchronous!
                    async function getAndGroupStuff() { 
                    ... 
                        ts = await lib.groupPromise(stuff,"t"); 
                    ... 
                    }
 LaToza                                GMU SWE 432 Fall 2019                             !3
                                Logistics
       • HW2 released 
           • Due 10/7 before class 
 LaToza                                GMU SWE 432 Fall 2019                             !4
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...Backend development swe fall web application review async programming example go get a candy bar second eachcandy thencombine group all twix musketeers milkyway dark snickers seconds each when done eat the explain latoza gmu await rules of road you can only call from function that is on functions return promise beware makes your code synchronous getandgroupstuff ts lib grouppromise stuff t logistics hw released due before class...

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