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The Composite Pattern in ECMAScript/JavaScript
An Introduction with Examples


Prof. David Bernstein
James Madison University

Computer Science Department
bernstdh@jmu.edu

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Motivation
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  • The Need:
    • Ignore differences between individual objects and compositions of objects
  • Examples:
    • Group "primitive" shapes in a drawing application
    • Group "rolling stock" in a locomotive scheduling application
    • Group "files" and "folders/directories"
One Version
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In UML:

images/composite.gif
An Example of the Composite Pattern
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A Recipe System

images/composite_example_ECMAScript.gif
An Example of the Composite Pattern (cont.)
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The Instruction Class Click here for a demonstration.

ecmascriptexamples/composite/Instruction.js
 

The Recipe Class

ecmascriptexamples/composite/Recipe.js
 

The Driver

ecmascriptexamples/composite/Driver.html
 
There's Always More to Learn
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