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Obtaining Closure with Anonymous Functions
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Andrew Cassell
May 22, 2014
Programming
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550
Obtaining Closure with Anonymous Functions
PHP Functional Programming using Functions, Lambdas, Anonymous Functions, and Closures.
Andrew Cassell
May 22, 2014
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Transcript
Obtaining Closure with Anonymous Functions @alc277
Functions&! Lambdas&! Anonymous&! Closures&! Fun.
Named Functions
Named Functions
Functions&! Lambdas&! Anonymous&! Closures&! Fun.
NAMED LAMBDA
Lambda Functions
None
Lambda Functions
Lambda Functions
Type Hinting
Wow much useful such amaze ! very programmer
Functions&! Lambdas&! Anonymous&! Closures&! Fun.
None
Anonymous Functions
Functions&! Lambdas&! Anonymous&! Closures&! Fun.
λ Closures Rasmus’s Throne Room
None
Lambda Variable Scope
Closure Variable Scope & “use”
Tricky Bit
Passing a Variable to a Lambda or Closure
None
Passing a Variable by Reference to a Lambda or Closure
None
None
Closure Class
Closure! {! ! /* Methods */! ! public bindTo ()
{ }! ! ! ! ! ! ! ! } PHP Closure Class ! ! ! ! public static bind () {}! ! ! ** double-secret function __invoke() { }! !
None
Reasons to use Closures • Variable Scope and Binding! •
Don’t Pollute Namespace With Functions! • Map/Reduce/Filter! • Data Output! • Retrieving Records from Database
• Currying! • Fixed-point Combinators (Y- Combinator)! • Improved Performance
(Memoization)! • Monads! • Dependency Injection Reasons to use Closures
Things to Avoid • create_function! • Closure::bind()
Map/Reduce/Filter
Map/Reduce/Filter with Lambda Credit: Fabien Potencier
Map/Reduce/Filter Credit: Fabien Potencier Map/Reduce/Filter with Closure
Currying Photo: Penn State Office of Research Communications.
Currying
DATA OUTPUT
Data Output
Data Output
Database Records
Data Output
Y-Combinator
Y-Combinator
Y-Combinator
None
Memoization
fib(5) = fib(3) + fib(4)! fib(3) = fib(1) + fib(2)!
fib(1) = 1! fib(2) = fib(1) + fib(0)! fib(1) = 1! fib(0) = 0! fib(2) = 1 + 0 = 1! fib(3) = 1 + 1 = 2! fib(4) = fib(3) + fib(2)! fib(3) = fib(1) + fib(2)! fib(1) = 1! fib(2) = fib(1) + fib(0)! fib(1) = 1! fib(0) = 0! fib(2) = 1 + 0 = 1! fib(3) = 1 + 1 = 2! fib(2) = fib(1) + fib(0)! fib(1) = 1! fib(0) = 0! fib(2) = 1 + 0 = 1! fib(4) = 2 + 1 = 3! fib(5) = 3 + 2 = 5
Memoization
1 1 2 1 3 2 4 3 5 5
6 8 7 13 8 21 9 34 10 55 11 89 12 144 13 233 14 377 15 610 16 987
Memoization
None
Monads
MonadPHP Anthony Ferrara
Monads Credit: Anthony Ferrara
Monads Credit: Anthony Ferrara
Monads Credit: Anthony Ferrara
$posts = [! [“title" => "foo", "author" => [“name" =>
"Bob", "email" => “bob@example.com”]],! [“title" => "bar", "author" => array("name" => "Tom", "email" => “tom@example.com”]],! [“title" => “baz"],! [“title" => "biz", "author" => array("name" => "Mark", "email" => “mark@example.com”]],! ]; Monads Credit: Anthony Ferrara
Monads Credit: Anthony Ferrara
Dependency! Injection
Dependency Injection
Dependency Injection
Dependency Injection
Dependency Injection
Dependency Injection