Quiz 4

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Quiz 4

This quiz is due WEDNESDAY, September 19, at 10:00AM Eastern Time. NOTE: This deadline has been *extended*; this quiz used to be due Monday, but the quiz schedule for the course has been pushed back by one lecture.

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When we went from fdC to lamC, we dropped the function's name. Why? (Choose ALL that apply) *

To avoid name clashes

The name isn't used anymore

So that all values can be anonymous

Because it complicates the application case in the interpreter

Required

The interpreter with lamC checks for numeric arguments to plus and mult, but the previous ones didn't. Why? *

Desugaring avoided the need for checking the type

All of the functions had a name

Numbers were the only kind of answer

Which of the following is a valid desugaring for (let ([x e1]) e2) using lambda? *

((lambda (x) e1) e2)

((lambda (x) e2) e1)

(lambda (x) e2)

Imagine we used substitution rather than environments in the lamC language. Then, substituting a value into an expression will always yield an expression that is the same size, where "size" is defined as the number of nodes in the expression tree. *

True

False

All top-level fdC definitions (in the interpreter with a list of FunDefC's) are actually closures even though they don't have an explicit environment field. *

True

False

Sometimes, we refactor code and rename identifiers. If we rename the parameter of a function to an identifier that doesn't appear anywhere else in the program, and consistently rename all of its uses in the body of the function, can the program's behavior change? *

(NOTE: This question was edited with "to an identifier that doesn't appear anywhere else in the program" on Sep 19, 2012)

Yes, no matter whether the language is lexically scoped or dynamically scoped

Yes if the language is lexically scoped, but not if it is dynamically scoped

Yes if the language is dynamically scoped, but not if it is lexically scoped

It cannot change, regardless of the kind of scoping.

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