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It's the only language that enjoys native support in web browsers.
It's the only language that allows dynamic distribution, that is, executing the same code (e.g., for business computations) either in the back-end or the front-end, depending on run-time conditions such as the available front-end resources.
It combines object-oriented with functional programming.
Its dynamism allows various forms of meta-programming, which means it gives you the liberty to program your own programming concepts like classes and enumerations.