We cannot treat JavaScript as a full-fledged programming language. It lacks the following important features −
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Client-side JavaScript does not allow the reading or writing of files. This has been kept for security reason.
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JavaScript cannot be used for networking applications because there is no such support available.
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JavaScript doesn't have any multi-threading or multiprocessor capabilities.
Once again, JavaScript is a lightweight, interpreted programming language that allows you to build interactivity into otherwise static HTML pages.
