Method chaining: Difference between revisions

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{{Short description|Programming syntax}}

{{refimprove|date=May 2008}}

'''Method chaining''', also known as '''named parameter idiom''', is a common [[Syntax (programming languages)|syntax]] for invoking multiple method calls in [[Object-oriented programming|object-oriented programming languages]]. Each method returns an object, allowing the calls to be chained together in a single statement without requiring variables to store the intermediate results.<ref>{{cite web

|accessdate = 2011-04-13

|publisher = First Class Thoughts

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| publisher = [[Prentice Hall]]

| year = 2008

| isbn = 978-0-13-235088-24

}}</ref>

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Compare:

<syntaxhighlight lang="cpp">

a << b << c;

</syntaxhighlight>

equivalent to:

<syntaxhighlight lang="cpp">

a << b;

a << c;

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Another example in [[JavaScript]] uses the built-in methods of Array:

<syntaxhighlight lang="javascript">

const interesting_products = products

somethings

.filter(x => x.count > 10)

.sort((a, b) => a.count - b.count)

.map(x => x.name)

</syntaxhighlight>

Note that in JavaScript <code>filter</code> and <code>map</code> return a new shallow copy of the preceding array but <code>sort</code> operates in place. To get a similar behavior, <code>toSorted</code> may be used. But in this particular case, <code>sort</code> operates on the new array returned from <code>filter</code> and therefore does not change the original array.

==See also==

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==References==

<ref>[https://programmingdive.com/method-chaining-in-php/ Method Chaining in PHP]</ref>

{{Reflist}}

==External links==

* [http://www.infoq.com/articles/internal-dsls-java Creating DSLs in Java using method chaining concept]

<ref>* [https://programmingdive.com/method-chaining-in-php/ Method Chaining in PHP]</ref>

{{Design patterns}}

{{DEFAULTSORT:Method Chaining}}