JavaScript Patterns: Build Better Applications with Coding and Design Patterns by Stefanov Stoyan

Author:Stefanov, Stoyan [Stefanov, Stoyan]
Language: eng
Format: azw3, epub
Tags: COMPUTERS / Programming Languages / JavaScript
ISBN: 9780596806774
Publisher: O'Reilly Media
Published: 2010-09-08T16:00:00+00:00

Chaining Pattern

The chaining pattern enables you to call methods on an object one after the other, without assigning the return values of the previous operations to variables and without having to split your calls on multiple lines:

myobj.method1("hello").method2().method3("world").method4();

When you create methods that have no meaningful return value, you can have them return this, the instance of the object they are working with. This will enable consumers of that object to call the next method chained to the previous:

var obj = { value: 1, increment: function () { this.value += 1; return this; }, add: function (v) { this.value += v; return this; }, shout: function () { alert(this.value); } }; // chain method calls obj.increment().add(3).shout(); // 5 // as opposed to calling them one by one obj.increment(); obj.add(3); obj.shout(); // 5

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