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anonymous functions !== closures

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Goran Rakic
2012-07-11 00:50:38 +02:00
parent 36a7359759
commit 44576ed005
1 changed files with 2 additions and 2 deletions
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_posts/03-02-01-Programming-Paradigms.md
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@@ -20,7 +20,7 @@ interfaces, inheritence, constructors, cloning, exceptions, and more.
PHP supports first-class functions. It is possible to define a new function and assign it to a variable name and built-in functions PHP supports first-class functions. It is possible to define a new function and assign it to a variable name and built-in functions
can be referenced and called dynamically. Functions can be passed as arguments to other functions (Higher-order functions) and function can be referenced and called dynamically. Functions can be passed as arguments to other functions (Higher-order functions) and function
can return other functions. New anonymous functions (also known as Closures) are present since PHP 5.3 (2009). can return other functions. New anonymous functions (with support for closures) are present since PHP 5.3 (2009).
{% highlight php %} {% highlight php %}
<?php <?php
@@ -49,7 +49,7 @@ $sin_plus_one = combine($plus_one, "sin");
print $sin_plus_one(M_PI);{% endhighlight %} print $sin_plus_one(M_PI);{% endhighlight %}
{% endhighlight %} {% endhighlight %}
The most common usage of higher-order functions is when implementing the strategy pattern. Built-in `array_filter` function asks both The most common usage of higher-order functions like `combine` above is when implementing the strategy pattern. Built-in `array_filter` function asks both
for the input array (data) and a function (strategy, callback) used as a filter criteria on each array item. for the input array (data) and a function (strategy, callback) used as a filter criteria on each array item.
Closures may be used to cross the variable scope without using any global variables. In the following example we have a function able Closures may be used to cross the variable scope without using any global variables. In the following example we have a function able