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These are a few key concepts of JavaScript language that developers should know: execution context, activation object, variable instantiation, scoping, closure, eval and "this" keyword. Knowing these would help one tremendously in Ajax development.

For example, when you write an inner function, you know that you can access the local variables defined in the outer function as if they were defined locally. You can also access the global variables. -Why? How does the host environment resolve such variables?

Another example: When you pass arguments to a function, you can access these arguments as if they were locally defined variables. How does this work?



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