Node_assignment(Web scraping)

Both the files use 'xmlhttprequest' module for hitting requests on server and 'cheerio' module for html DOM manipulation similar to jquery.

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assignment_asyncmap.js

This js file uses async.mapLimit for running 5 async requests in parallel at a time. Concurrency=5.

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assignment_asyncforEach.js

This js file uses async.forEachSeries for making async requests synchronous by running one at a time. Concurrency=1.

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promises_qmap.js(without using async)

This js file uses Q promise module instead of callbacks for running 5 async requests in parallel at a time. Concurrency=5.