How do I return something to OCaml?

OCaml doesn’t have a return keyword — the last expression in a function becomes the result of the function automatically.

Should I use return rust?

> You don’t need the `return` keyword in Rust, if the last expression in a function body (or any other body, we’ll see more of this later) is not finished with a semicolon, then it is the return value. So `foo` will always return “world”.

What is imperative OCaml?

OCaml supports imperative programming through the primitive parameterized ref type. A value of type “int ref” is a pointer to a location in memory, where the location in memory contains an integer. It’s analogous to “int*” in C/C++ or “Integer” in Java (but not “int” in Java).

Why is OCaml called OCaml?

What is the meaning of the name “OCaml” CAML once was an acronym that stood for “Categorical Abstract Machine Language”, an abstract machine its early versions targeted. The evaluation model has changed since then, but the name stuck.

How do I reverse a list in OCaml?

flatten in the Ocaml standard library. val reverse : ‘a list -> ‘a list reverse xs returns a list containing the elements of the list xs in reverse order. Note: This function is called List. rev in the Ocaml standard library.

How do I open an OCaml file?

Starting OCaml

1. In a terminal window, type utop to start the interactive OCaml session, commonly called the toplevel.
2. 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.

How do I return nothing in Rust?

1 Answer. Use Option . An Option can either hold Some(T) (some value of type T , where T is a generic type parameter) or None (no value). For more information, read the Error Handling chapter in The Rust Programming Language.

Is Rust explicit or implicit?

Magic is okay in Other Language Y , but Rust is supposed to be an explicit language, so we should go with Feature Design Z instead. I’ve come to strongly dislike these comments, because they contain very little actionable feedback.

Is OCaml functional or imperative?

While OCaml is a functional programming language and emphasises pure functional style, it allows mutable (variables and values) and hence imperative programming style.

What are Functors in OCaml?

A functor is a module that is parametrized by another module, just like a function is a value which is parametrized by other values, the arguments. It allows one to parametrize a type by a value, which is not possible directly in OCaml without functors.

What is written in OCaml?

Software written in OCaml 0install, a multi-platform package manager. Coccinelle, a utility for transforming the source code of C programs. Coq, a formal proof management system. FFTW, a library for computing discrete Fourier transforms.

What is Xs in OCaml?

It is usually used if you have a function or value that is very similar to some other, but is in some way new or modified. In your example, xs is a list that should be summed and the pattern matching decomposes the list and gives you a new list (without the first element) that you need to sum, so it is called xs’

Why doesn’t OCaml have a for loop?

Functional programmers tend to use recursion instead of explicit loops, and regard for loops with suspicion since it can’t return anything, hence OCaml’s relatively powerless for loop. We talk about recursion below. While loops in OCaml are written:

Do we talk about recursion in OCaml?

We talk about recursion below. While loops in OCaml are written: As with for loops, there is no way provided by the language to break out of a while loop, except by throwing an exception, and this means that while loops have fairly limited use.

How do you use if statements in ococaml?

OCaml has an if statement with two variations, and the obvious meaning: if boolean-condition then expression if boolean-condition then expression else other-expression. Unlike in the conventional languages you’ll be used to, if statements are really expressions.