Tag: functional
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Most referenced — #functional
Memoization 3Functional Array Methods (JS) 2Array.flat() & Array.flatMap() 2array_find() / array_find_key() (PHP 8.4) 2JavaScript Closures 2First Class Callable Syntax (PHP 8.1) 2array_map / filter / reduce as FP Patterns 1Anonymous Functions / Closures (PHP 5.3) 1
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Anonymous Functions / Closures (PHP 5.3) PHP 5.3+
PHP 5.3 introduced anonymous functions (closures) — function() {} expressions assignable to variables, passable as callbacks, and able to capture outer scope with use().
2mo ago
php intermediate
Array.flat() & Array.flatMap() ES2019
Array.flat(depth) flattens nested arrays; Array.flatMap() maps then flattens one level — more efficient than map().flat() and great for expanding items.
2mo ago
javascript beginner
array_find() / array_find_key() (PHP 8.4) PHP 8.4+
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.
2mo ago
php beginner
array_map / filter / reduce as FP Patterns PHP 5.3+
PHP's array_map(), array_filter(), and array_reduce() enable functional-style data transformation pipelines — cleaner than imperative loops for many common patterns.
2mo ago
php intermediate
Advanced Array Functions PHP 5.0+
PHP's array_walk, usort, array_reduce, array_column, and array_combine enable expressive data transformation without explicit loops.
2mo ago
php intermediate
Arrow Functions (PHP 7.4) PHP 7.4+
Concise single-expression anonymous functions using fn() that implicitly capture outer-scope variables by value.
2mo 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.
2mo 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.
2mo ago
php intermediate
Functional Array Methods (JS) ES2015 map, filter, reduce, find, flatMap, every, some — JavaScript's built-in higher-order array methods for expressive data transformation.
2mo ago
javascript beginner
Generators & yield PHP 5.5+ Generators allow iterating over large datasets lazily using yield, without loading everything into memory at once.
2mo 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.
2mo ago
javascript intermediate
Key Array Functions (array_map, array_filter, array_reduce…) PHP 5.0+
PHP's functional array processing functions enable expressive, pipeline-style transformations without explicit loops.
2mo 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.
2mo 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.
2mo ago
performance intermediate
Pure Function
A function whose output depends only on its inputs and that produces no side effects — maximally testable and predictable.
2mo ago
quality intermediate
Python Decorators Python 2.4+ Functions that wrap other functions to add behaviour — @cache, @dataclass, @property — applied at definition time with the @ syntax.
2mo ago
python intermediate
Python Generators & yield Python 2.2+
Functions that yield values one at a time — enabling lazy evaluation of infinite sequences without storing all values in memory.
2mo ago
python intermediate
Side Effects
Observable changes a function makes beyond returning a value — modifying global state, I/O, mutation of arguments — that make code harder to reason about.
2mo ago
quality intermediate
Closures & Anonymous Functions PHP 5.3+
First-class anonymous functions that can capture variables from their enclosing scope via the use keyword.
2mo ago
php intermediate
Immutability PHP 8.1+
Objects whose state cannot change after construction — immutable objects are inherently thread-safe, predictable, and easy to reason about.
2mo ago
quality intermediate