Table of Contents
How does map work in SML?
map. The map function takes a function F and a list [a1,a2,…,an], and produces the list [F(a1), F(a2),…, F(an)]. That is, it applies F to each element of the list and returns the list of resulting values.
What is Foldl in SML?
foldl folds a list of values. into a single value starting with the leftmost element. Example: – foldl (fn (a,b) => a+b) 2 [1,2,3];
What is SML language?
Standard ML (SML) is a general-purpose modular functional programming language with compile-time type checking and type inference. It is popular among compiler writers and programming language researchers, as well as in the development of theorem provers.
How do you test SML?
To test ML functions, go to the sml window. Enter the command use “filename. sml”; to load and compile the file you’ve just edited. You can interactively test each function as you add it.
How do I find the length of a list in SML?
Here is a pattern-matching straight recursion version which doesn’t use the built-in length function but instead computes the total length (“tol”) directly: fun tol [] = 0 | tol ([]::xss) = tol xss | tol ((x::xs)::xss) = 1 + tol (xs::xss);
What is tail recursion in SML?
A function call is called a tail call if the caller does not modify or examine the result of the function call. If every recursive call made by a function is a tail call, that function is called tail recursive.
Is foldLeft tail recursive?
The foldLeft and product methods are tail-recursion optimized already, so they solve the problem with recursion without leaking their detals to the caller.
What are constructors in SML?
It is important in SML to distinguish constructors from ordinary functions. Constructors are the primitive functions that create new values of a data. For example, the constructors for lists are :: and nil . The append function @ is not a constructor (it can be defined using :: and nil ).
How do I compile SML?
The Edit, Compile, Debug Cycle in SML To test ML functions, go to the sml window. Enter the command use “filename. sml”; to load and compile the file you’ve just edited. You can interactively test each function as you add it.
What is the difference between tail and non-tail recursion?
In tail recursion, there is no other operation to perform after executing the recursive function itself; the function can directly return the result of the recursive call. In non-tail recursion, some operations need to be performed using the returned value of the recursive call.
What is foldRight?
The foldRight method takes an associative binary operator function as parameter and will use it to collapse elements from the collection. The order for traversing the elements in the collection is from right to left and hence the name foldRight. The foldRight method allows you to also specify an initial value.
Is fold right tail recursive?
foldRight and reduceRight are in fact tail recursive for Array. It’s basically converted into a foldLeft where the index varies in the other direction.
Is ML a programming?
ML (Meta Language) is a general-purpose functional programming language.