Collection

• PHP
  • immutable.php - Immutable collections, with filter, map, join, sort, slice, and other methods. Well-suited for functional programming and memory-intensive applications. Runs especially fast in PHP7
  • php-collections - A PHP implementation of a templated list. The Collection class allows one object type and its subtypes to be added to the collection. Many standard PHP array functions are encapsulated in the collection.
  • phpfunct/funct - A PHP library with commonly used code blocks
• JS
  • immutable-js - Immutable collections for JavaScript
• Tutorial
  • Collection Classes in PHP