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narkisr on 03/17/09

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Last Edited at 03/17/09 08:34am

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WithIndex Groovy category

/ Published in: Groovy

An example of utilizing a category in Groovy in order to create withIndexfunctionality on lists each methods (traversing the list and having the index on each step), @ http://markmail.org/message/pa2irg4mvydpxi7c

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class WithIndexCategory { 
    static List withIndex(List source) { 
           def idx = 0 source.collect { [index: idx++, value: it] } 
    } 
}
 
use(WithIndexCategory) { l = [ 3, 1, 4, 1, 5, 9 ]
 
l.withIndex().each { if(it.index % 2) println it.value } }