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OGNL is the Object Graph Navigation Language - see http://www.ognl.org for the full documentation of OGNL. In this document we will only show a few examples of OGNL features that co-exist with Webwork.

Basic Expressions

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basic basic

To review basic concepts, refer to OGNL

Collections (Maps, Lists)

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Collections Collections

Dealing with collections(map,listmaps, lists, and sets) in webwork comes often, so here are a few examples using the select tag:
Syntax for list: {e1,e2}. This creates a List containing the String "name1" and "name2."

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Lambda Expressions

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Lambda Lambda

OGNL supports basic lamba expression syntax enabling you to write simple functions.

For example:

For all you math majors who didn't think you would ever see this one again.
fibonacci Fibonacci: if n==0 return 0; elseif n==1 return 1; else return fib(n-2)+fib(n-1);
fib(0) = 0
fib(1) = 1
fib(11) = 89

The lambda expression is everything inside the brackets. The #this variable holds the argument to the expression, which is initially starts at 11.

<ui<ww:property value="#fib =:[#this==0 ? 0 : #this==1 ? 1 : #fib(#this-2)+#fib(#this-1)], #fib(11)" />

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