COMPUTER SCIENCE AND ENGINEERING
DATA STRUCTURES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the difference between [[ and $ used on a list?
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[[ is type-safe
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[[ always returns a list
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[[ requires quotes (")
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None of the above
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Explanation:
Detailed explanation-1: -There is an incredibly important difference between them: list is a plain old function, while quote (even without the special ‘ syntax) is a special form. That is, list can be implemented in plain Scheme, but quote cannot be.
Detailed explanation-2: -quote takes exactly one argument, and returns a data structure whose printed representation is the same as what you typed in as the argument to quote . Scheme does not evaluate the argument to quote as an expression–it just gives you a pointer to a data structure.
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