Tag: functional
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Most referenced — #functional
Anonymous Functions / Closures (PHP 5.3) 2Side Effects 2Python Decorators 2array_map / filter / reduce as FP Patterns 1Array.flat() & Array.flatMap() 1List Comprehensions & Generator Expressions 1JavaScript Closures 1Generators & yield 1
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Rust Iterator Adapters
Iterator adapters are lazy combinators like map and filter that transform iterators without doing work until a consumer drives them.
2w ago
Rust intermediate
Anonymous Functions / Closures (PHP 5.3)
PHP 5.3+
1
PHP 5.3 introduced anonymous functions (closures) — function() {} expressions assignable to variables, passable as callbacks, and able to capture outer scope with use().
3mo ago
PHP intermediate
Array.flat() & Array.flatMap()
ES2019
1
Array.flat(depth) flattens nested arrays; Array.flatMap() maps then flattens one level — more efficient than map().flat() and great for expanding items.
3mo ago
JavaScript beginner
array_find() / array_find_key() (PHP 8.4)
PHP 8.4+
4
PHP 8.4 adds array_find() and array_find_key() — built-in functions that return the first element (or key) matching a callback predicate, replacing verbose foreach loops or array_filter() + reset() patterns.
3mo ago
PHP beginner
array_map / filter / reduce as FP Patterns
PHP 5.3+
1
PHP's array_map(), array_filter(), and array_reduce() enable functional-style data transformation pipelines — cleaner than imperative loops for many common patterns.
3mo ago
PHP intermediate
Advanced Array Functions
PHP 5.0+
1
PHP's array_walk, usort, array_reduce, array_column, and array_combine enable expressive data transformation without explicit loops.
3mo ago
PHP intermediate
Arrow Functions (PHP 7.4)
PHP 7.4+
1
Concise single-expression anonymous functions using fn() that implicitly capture outer-scope variables by value.
3mo ago
PHP beginner
First Class Callable Syntax (PHP 8.1)
PHP 8.1+
Creates a Closure from any callable using func(...) syntax, replacing the verbose Closure::fromCallable() boilerplate.
3mo ago
PHP intermediate
First-Class Callable Syntax (PHP 8.1)
PHP 8.1+
PHP 8.1's Closure::fromCallable() shorthand — strlen(...) creates a Closure from any callable without verbose wrapper syntax.
3mo ago
PHP intermediate
Functional Array Methods (JS)
ES2015
2
map, filter, reduce, find, flatMap, every, some — JavaScript's built-in higher-order array methods for expressive data transformation.
3mo ago
JavaScript beginner
Generators & yield
PHP 5.5+
2
Generators allow iterating over large datasets lazily using yield, without loading everything into memory at once.
3mo ago
PHP intermediate
JavaScript Closures
ES5 A function that retains access to its enclosing scope's variables even after the outer function has returned — the foundation of data privacy in JS.
3mo ago
JavaScript intermediate
Key Array Functions (array_map, array_filter, array_reduce…)
PHP 5.0+
6
PHP's functional array processing functions enable expressive, pipeline-style transformations without explicit loops.
3mo ago
PHP beginner
List Comprehensions & Generator Expressions
Python 2.0+
Compact syntax for creating lists — [x*2 for x in range(10) if x%2==0] — and lazy generators that avoid materialising the full sequence.
3mo ago
Python beginner
Memoization
Caching the result of a pure function call keyed by its arguments so repeated calls with the same inputs return immediately.
3mo ago
Performance intermediate
Pure Function
A function whose output depends only on its inputs and that produces no side effects — maximally testable and predictable.
3mo ago
Code Quality intermediate
Python Decorators
Python 2.4+
1
Functions that wrap other functions to add behaviour — @cache, @dataclass, @property — applied at definition time with the @ syntax.
3mo ago
Python intermediate
Python Generators & yield
Python 2.2+
1
Functions that yield values one at a time — enabling lazy evaluation of infinite sequences without storing all values in memory.
3mo ago
Python intermediate
Side Effects
2
Observable changes a function makes beyond returning a value — modifying global state, I/O, mutation of arguments — that make code harder to reason about.
3mo ago
Code Quality intermediate
Closures & Anonymous Functions
PHP 5.3+
1
First-class anonymous functions that can capture variables from their enclosing scope via the use keyword.
3mo ago
PHP intermediate