How to wait for the completion of two async functions that should run parallel [duplicate]

How to wait for the completion of two async functions that should run
parallel [duplicate]

References

Reference NO 1

http://stackoverflow.com/questions/15199331/how-to-wait-for-the-completion-of-two-async-functions-that-should-run-parallel

Reference NO 2

http://stackoverflow.com/questions/8744092/node-js-waiting-for-multiple-functions-to-complete

Reference NO 3

http://msdn.microsoft.com/en-us/library/hh873173.aspx

Reference NO 4

http://msdn.microsoft.com/en-us/library/vstudio/hh556530.aspx

Reference NO 5

http://www.sebastianseilund.com/nodejs-async-in-practice

Reference NO 6

http://www.codeproject.com/Articles/518856/Task-Parallel-Library-and-async-await-Functionalit

Reference NO 7

http://stevehanov.ca/blog/index.php?id=127

Reference NO 8

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