Obtaining Closure with Anonymous Functions

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Obtaining Closure with Anonymous Functions @alc277

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Functions&! Lambdas&! Anonymous&! Closures&! Fun.

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Named Functions

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Named Functions

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Functions&! Lambdas&! Anonymous&! Closures&! Fun.

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NAMED LAMBDA

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Lambda Functions

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Lambda Functions

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Lambda Functions

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Type Hinting

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Wow much useful such amaze ! very programmer

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Functions&! Lambdas&! Anonymous&! Closures&! Fun.

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Anonymous Functions

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Functions&! Lambdas&! Anonymous&! Closures&! Fun.

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λ Closures Rasmus’s Throne Room

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Lambda Variable Scope

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Closure Variable Scope & “use”

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Tricky Bit

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Passing a Variable to a Lambda or Closure

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Passing a Variable by Reference to a Lambda or Closure

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Closure Class

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Closure! {! ! /* Methods */! ! public bindTo () { }! ! ! ! ! ! ! ! } PHP Closure Class ! ! ! ! public static bind () {}! ! ! ** double-secret function __invoke() { }! !

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Reasons to use Closures • Variable Scope and Binding! • Don’t Pollute Namespace With Functions! • Map/Reduce/Filter! • Data Output! • Retrieving Records from Database

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• Currying! • Fixed-point Combinators (Y- Combinator)! • Improved Performance (Memoization)! • Monads! • Dependency Injection Reasons to use Closures

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Things to Avoid • create_function! • Closure::bind()

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Map/Reduce/Filter

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Map/Reduce/Filter with Lambda Credit: Fabien Potencier

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Map/Reduce/Filter Credit: Fabien Potencier Map/Reduce/Filter with Closure

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Currying Photo: Penn State Ofﬁce of Research Communications.

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Currying

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DATA OUTPUT

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Data Output

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Data Output

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Database Records

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Data Output

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Y-Combinator

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Y-Combinator

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Y-Combinator

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Memoization

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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

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Memoization

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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

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Memoization

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Monads

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MonadPHP Anthony Ferrara

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Monads Credit: Anthony Ferrara

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Monads Credit: Anthony Ferrara

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Monads Credit: Anthony Ferrara

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$posts = [! [“title" => "foo", "author" => [“name" => "Bob", "email" => “[email protected]”]],! [“title" => "bar", "author" => array("name" => "Tom", "email" => “[email protected]”]],! [“title" => “baz"],! [“title" => "biz", "author" => array("name" => "Mark", "email" => “[email protected]”]],! ]; Monads Credit: Anthony Ferrara