OCaml Cookbook Recipes

The OCaml Cookbook is a place where OCaml developers share how to solve common tasks using packages from the ecosystem.

A task is something that needs to be done inside a project. A recipe is a code sample and explanations on how to perform a task using a combination of open source libraries. Some tasks can be performed using different combination of libraries, each is a different recipe. Tasks don't describe how to use the standard library or language features.

OCaml developers are warmly invited to contribute categories, tasks, and recipes. See the Cookbook section of the CONTRIBUTING.md file in our GitHub repo.

The OCaml guides are recommend reading, for instance recipes handle errors as described in the Error Handling guide.

Command Line

Task

Opam Packages Used

Parse Command Line Arguments

This task has no recipes yet, maybe you want to contribute a recipe!

Using the ANSI Terminal

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Compilation & Linking

Task

Opam Packages Used

Compile and Link to a Bundled C Library

This task has no recipes yet, maybe you want to contribute a recipe!

Generate OCaml Bindings for a C Library

This task has no recipes yet, maybe you want to contribute a recipe!

Compression

Task

Opam Packages Used

Decompress a Single File Compressed With GZIP using camlzip

camlzip

Compress a Single File with GZIP using camlzip

camlzip

Decompress a ZIP Archive Containing Multiple Files using camlzip

camlzip

Create a ZIP Archive Containing Multiple Files using camlzip

camlzip

Decompressing a Tarball

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Compress a Directory Into a Tarball

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Concurrency & Parallelism

Parallelism & Multi-Threading

Task

Opam Packages Used

Spawn a Thread and Receive a Response

This task has no recipes yet, maybe you want to contribute a recipe!

Pass Data Between Parallel Threads

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Single-Threaded Concurrency

Task

Opam Packages Used

Create and Await Promises

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Cryptography

Task

Opam Packages Used

Calculate the SHA-256 Digest of a File using cryptokit

Sign and Verify a Message With an HMAC Digest using cryptokit

Salt and Hash a Password With PBKDF2

This task has no recipes yet, maybe you want to contribute a recipe!

Data Structures & Algorithms

Hash Tables

Task

Opam Packages Used

Use a Hash Table With Given Key and Value Types

This task has no recipes yet, maybe you want to contribute a recipe!

Sorting

Task

Opam Packages Used

Sorting Lists and Arrays using the Standard Library

-

Database

PostgreSQL

Task

Opam Packages Used

PostgreSQL CREATE, INSERT, SELECT

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PostgreSQL Aggregate Query

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PostgreSQL Full Text Search

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SQLite

Task

Opam Packages Used

SQLite CREATE, INSERT, SELECT using ppx_rapper_lwt

ppx_rapper_lwt ppx_rapper caqti-driver-sqlite3 caqti-lwt lwt

SQLite Full Text Search

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Data Formats

YAML

Task

Opam Packages Used

Serialise YAML Data

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Deserialise YAML Data using hl_yaml

hl_yaml ppx_deriving_yojson

yaml ppx_deriving_yaml

Deserialise and Post-Process YAML Data using hl_yaml

hl_yaml ppx_deriving_yojson

yaml ppx_deriving_yaml

JSON

Task

Opam Packages Used

Serialise JSON Data using ppx_yojson_conv

ppx_yojson_conv yojson

Deserialise JSON Data using ppx_yojson_conv

ppx_yojson_conv yojson

CSV

Task

Opam Packages Used

Read Tuples / Records from CSV

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Serialise Tuples / Records to CSV

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Date and Time

Task

Opam Packages Used

Get Today's Date using the Standard Library

-

Measure Elapsed Time

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Convert a Local Time to Another Time Zone

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Convert Between Date and Unix Timestamp

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Display Formatted Date and Time

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Parse Date and Time from String

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Debugging

Task

Opam Packages Used

Debug Print a Value

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Log a Debug / Error Message to Stdout / Stderr

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Log to the Unix Syslog

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Encoding

Task

Opam Packages Used

URL- / Percent-Encode a String

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Encode a String as application/x-www-form-urlencoded

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Encode and Decode Bytestrings From Hex-Strings

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Encode and Decode Base64

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Read and Write Integers in Little-Endian Byte Order

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File System

Task

Opam Packages Used

Read and Write from a Text File using the Standard Library

-

Basic File and Directory Operations using the Standard Library

-

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Change File Permissions

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This task has no recipes yet, maybe you want to contribute a recipe!

Find Files Matching a Pattern

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Random Values

Task

Opam Packages Used

Generate Random `int`, `float`, and `char` using mirage-crypto-rng

mirage-crypto-rng cstruct randomconv

Mathematics

Geographical Calculations

Task

Opam Packages Used

Calculate Geodistance Between Two Points

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Vector & Matrix Operations

Task

Opam Packages Used

Normalise a Vector using the Standard Library

-

Matrix Addition and Multiplication

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Invert a Matrix

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Nearest-Neighbour Search

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Operating System

Task

Opam Packages Used

Run an External Command and Process Stdout using feather

feather

shexp

using the Standard Library

-

Run Piped External Commands using feather

feather

shexp

Read an Environment Variable using the Standard Library

-

Graphical User Interfaces

There's nothing in this category yet.

Text Processing

Regular Expressions

Task

Opam Packages Used

Validate an Email Address using re

re

Extract Phone Numbers from Text

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Replace All Occurrences of a Text Pattern With Another Pattern

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UTF-8

Task

Opam Packages Used

UTF-8 Text Processing

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Unicode

Task

Opam Packages Used

Collect Unicode Graphemes

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Web Programming

URL and URI Processing

Task

Opam Packages Used

Parse a URI from String and Access Individual Parts using uri

uri

Encode a URI to String using uri

uri

Media Types (MIME)

Task

Opam Packages Used

Get MIME Type From String

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Get MIME Type From Filename

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Parse MIME Type of an HTTP Response

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Running a Web Server

Task

Opam Packages Used

Start a Web Server With a 'Hello World' Endpoint

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Start a Web Server That Serves an HTML Template

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Use Basic Authentication to Secure a Route

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Dealing With HTML

Task

Opam Packages Used

Render an HTML Template

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Extract All Links From an HTML String

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Check a Webpage for Broken Links

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HTTP Clients

Task

Opam Packages Used

Make a HTTP GET Request

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Make a HTTP GET Request With Basic Authentication

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Download a File to a Temporary Directory

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Make a Partial Download With HTTP Range Header

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