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JavaScript: Interpreted by client and NOT compiled
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Java: Compiled on Server before execution on client
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Note both are reasonably "pure" C/C++ like languages and do NOT have useful sh/awk text and system enhancements of Perl(5)
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JavaScript: Object based -- no classes or inheritance -- built in extensible objects
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Java: Object-oriented. Programs consist of object classes with inheritance
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JavaScript: Integrated with HTML as embedded ascii but of course HTML looks rather irrelevant at times!
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Java: Applets distinct from HTML but invoked from HTML Pages
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JavaScript: do not declare variables' datatypes -- Loose typing
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Java: MUST declare variables' datatypes -- Strong typing
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JavaScript -- Dynamic Binding -- object references computed at runtime
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Java -- Static Binding -- object references must exist at compile time
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Java and JavaScript are secure and cannot write to disk
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