What design pattern does these code follow?

Question

in jQuery we often do this:

$('#el1').css('margin-left','5px').attr('title','test title').removeClass('class1');

in Java StringBuilder, same as above：

StringBuilder builder  = new StringBuilder();  
builder.append("str1").insert(0, 'A').deleteCharAt(2);

So, what design pattern does this code follow?

score 5 · Accepted Answer · answered Feb 25 '13 at 03:11

5

It's an application of the fluent interface pattern.

answered Feb 25 '13 at 03:11

Matt Ball

1

...and it was a brilliant idea. [Martin Fowler's article](http://www.martinfowler.com/bliki/FluentInterface.html) on it is somewhat more descriptive than Wikipedia. – Ryan Stewart Feb 25 '13 at 03:14
I though it was a Builder design pattern as sated [here](http://stackoverflow.com/a/2707195/1065197). – Luiggi Mendoza Feb 25 '13 at 04:23
1

@LuiggiMendoza [builders frequently use a fluent interface.](http://en.wikipedia.org/wiki/Builder_pattern#Useful_tips) `StringBuilder` is a fluent builder for `String`s, which should come as absolutely no surprise to you. – Matt Ball Feb 25 '13 at 04:25
Thanks for the informative link – Luiggi Mendoza Feb 25 '13 at 04:40

score 0 · Answer 2 · answered Feb 25 '13 at 03:14

0

Its called as method chaining/named parameter idiom in OOP language. Refer http://en.wikipedia.org/wiki/Method_chaining

answered Feb 25 '13 at 03:14

Jaydeep Rajput

I disagree with you and the Wikipedia article in calling this "named parameters." **This** is named parameters: http://en.wikipedia.org/wiki/Named_parameter – Matt Ball Feb 25 '13 at 03:31
http://stackoverflow.com/questions/1988016/named-parameter-idiom-in-java – Jaydeep Rajput Feb 25 '13 at 03:34
That's funny, because http://stackoverflow.com/questions/1988016/named-parameter-idiom-in-java#comment1905024_1988035 – Matt Ball Feb 25 '13 at 03:34
The wiki article which I mentioned in answer calls it "Named Parameter Idiom" also :) – Jaydeep Rajput Feb 25 '13 at 03:36
I already mentioned that you're not the only one I disagree with on this. – Matt Ball Feb 25 '13 at 03:36

2 Answers2