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Sets

Filtering a Set

The function StringSet.filter of type (string -> bool) -> StringSet.t -> StringSet.t creates a new set by keeping the elements that satisfy a predicate from an existing set.

Profiling

.data

.long writes a word (4 bytes) to the current segment. .byte writes a single byte. .ascii writes a string of bytes (NOT nul-terminated). .space writes the given number of zero bytes. Normall

Maps

Filtering a Map

To filter a map, use the filter function. It takes a predicate to filter entries and a map. It returns a new map containing the entries satisfying the predicate.

Preprocessors and PPXs

PPXs

PPxs are a different kind of preprocessor—one that does not run on the textual source code, but rather on the parsing result: the Abstract Syntax Tree (AST), which in the OCaml compiler is call

Arrays

Length of an Array

The Array.length function returns the size of an array:

File Manipulation

Example

<!-- $MDX dir=examples --> We can compile and run this example: <!-- $MDX file=examples/file_manip.ml -->

Maps

Map a Map

The keys are the same in both maps. For each key, a value in lucky_numbers is converted into a value in lucky_strings using string_of_int . Using StringMap.map , we create a map associatin

Sets

Conclusion

We gave an overview of OCaml's Set module by creating a StringSet module using the Set.Make functor. Further, we looked at how to create sets based on a custom comparison function. For more in

Sets

Union of Two Sets

With the function StringSet.union , we can compute the union of two sets.

Sets

Working With Sets

Let's look at a few functions for working with sets using these two sets.

Maps

Conclusion

For more information, refer to Map in the Standard Library documentation. This was an overview of OCaml's Map module. Maps are reasonably efficient and can be an alternative to the imperativ

Maps

Working With Maps

Throughout the rest of this tutorial, we will use the following map:

Configuring Your Editor

Vim

After installing Merlin above, instructions will be printed on how to link Merlin with your editor. If you do not have them visible, just run this command: For Vim, we won't use the LSP server b

Profiling

.text

Text is the Unix way of saying "program code". The text segment simply means the part of the executable where program code is stored. The .text directive switches the assembler so it starts w

Operators

Goals

Using operators as functions and reciprocally, using functions as operators Assign the right associativity and precedence to a custom operator Use and define custom let binders The learning goals o

First-Class Modules

Heterogeneous Collections

First-Class Modules

Plugin Registry