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provides many useful built-in functions and operators.
The built-in functions include connect(), debug(), eval(), isFinite(), isNaN(), killTimer(), killTimers(), parseFloat(), parseInt() and startTimer().
Classes, functions, variables and constants are declared with class, function, var and const respectively.
reserves the following words for future use: boolean, byte, char, debugger, double, enum, export, float, goto, implements, import
int, interface, long, native, short, synchronized, throws, transient and volatile. It is unadvisable to use any of these words as identifiers.