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

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Compression

Task

Opam Packages Used

Read a gzip compressed text file

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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

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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

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Sign and Verify a Message with an HMAC Digest

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Salt and Hash a Password with PBKDF2

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Data Structures & Algorithms

Hash Tables

Task

Opam Packages Used

Use a Hash Table With Given Key and Value Types

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Sorting

Task

Opam Packages Used

Sorting Lists and Arrays

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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

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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

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JSON

Task

Opam Packages Used

Serialise JSON Data

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Deserialise JSON Data

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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

File Paths

There's nothing in this category yet.

Directories

Task

Opam Packages Used

Create Directory

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List Directory Contents

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Get Current Directory

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Change Current Directory

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Find Files Matching a Pattern

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Files

Task

Opam Packages Used

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Read a Text File using the Standard Library

-

Write to a File

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Check if a File Exists

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

Change File Permissions

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Create Temporary File

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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

Normalize a Vector

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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

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Run Piped External Commands

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Read an Environment Variable

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Graphical User Interfaces

There's nothing in this category yet.

Text Processing

Regular Expressions

Task

Opam Packages Used

Validate an Email Address

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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 URL from String And Access Individual Parts

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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 a 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 a 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 a HTML Template

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Extract all Links from a 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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