What does map do OCaml?
Map creates a “mapping”. For instance, let’s say I have some data that is users and their associated passwords. I could with the Map module create a mapping from user names to their passwords. The mapping module not only does this but it does it fairly efficiently.
What is a list in OCaml?
A list is an ordered sequence of elements. All elements of a list in OCaml must be the same type. Lists are built into the language and have a special syntax.
What is cons in OCaml?
A good example is a traditional Lisp-style list type: a Lisp list is either nil (empty), or it is a cons, which is a pair consisting of some value (of any type) — traditionally called the car — representing the first element of the list, and another list — traditionally called the cdr — representing the rest of the …
How do I create an OCaml record?
A record represents a collection of values stored together as one, where each component is identified by a different field name. The basic syntax for a record type declaration is as follows: type = { : ; : ; } Note that record field names must start with a lowercase letter.
WHAT IS A in OCaml?
The type ‘a is a type variable, and stands for any given type. The reason why sort can apply to lists of any type is that the comparisons (=, <=, etc.) are polymorphic in OCaml: they operate between any two values of the same type. This makes sort itself polymorphic over all list types.
How do I run OCaml in terminal?
Starting OCaml
- In a terminal window, type utop to start the interactive OCaml session, commonly called the toplevel.
- Press Control-D to exit the toplevel. You can also enter #quit;; and press return. Note that you must type the # there: it is in addition to the # prompt you already see.
What is <> in OCaml?
Comparisons (Relational Operators) OCaml distinguishes between structural equality and physical equality (essentially equality of the address of an object). = is structural equality and == is physical equality. Beware: <> is structural not-equals while != is physical not-equals.
What is ACC in OCaml?
A simple example is using an accumulator to add up a list of integers. You could do this with a function like so: let rec sum xs acc = match xs with. | [] -> acc.
How do you mod OCaml?
Using the OCaml toplevel system….Basic Expressions and Types.
| Operator | Meaning |
|---|---|
| mod | take two ints and return their integer remainder |
| >,>=,<,<= | take two ints (or two floats) and return their comparison |
| = | take two values and return whether they are equal |
| ^ | take two strings and return their concatenation into a new string |