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27-Jul-2017 07:19

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The effective method gets assembled based on the class of the argument and the at runtime available and applicable methods.How would you rank the popularity of a programming language?Most programmers today who are aware of the term macro have encountered them in C or C , where they are a static feature which are built in a small subset of the language, and are capable only of string substitutions on the text of the program.In dynamic languages, however, they provide access to the inner workings of the compiler, and full access to the interpreter, virtual machine, or runtime, allowing the definition of language-like constructs which can optimize code or modify the syntax or grammar of the language.These behaviors could include extension of the program, by adding new code, by extending objects and definitions, or by modifying the type system.Although similar behaviours can be emulated in nearly any language, with varying degrees of difficulty, complexity and performance costs, dynamic languages provide direct tools to make use of them.

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You can always add debugging code or breakpoints to your wrappers to trap when they're called. Try trapping all the calls to, say, the sqrt() function, counting how many times sqrt() is called during a typical run, or writing a message to a log every time sqrt() is called.

However, Erik Meijer and Peter Drayton suggest that programmers "use eval as a poor man's substitute for higher-order functions." A type or object system can typically be modified during runtime in a dynamic language.



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