collectWithIndex in the cheap

Enumerate.groovy

@Category(List)
class Enumerator {
    def collectWithIndex(Closure closure) {
        def index = 0
        this.collect { closure.call(it, index++) }
    }
}

println 'iterating with indices using Object.eachWithIndex'

['foo', 'bar', 'boo', 'baz'].eachWithIndex { e, i ->
    println "element[$i] == $e"
}

println ''

println 'collecting with indices using Enumerator.collectWithIndex'

use(Enumerator) {
    println(['foo', 'bar', 'boo', 'baz'].
        collectWithIndex { e, i -> "element[$i] == $e" }.
        join("\n"))
}

enumerate.py

print '\n'.join(
    'element[{0}] == {1}'.format(index, element) for
        index, element in
        enumerate(['foo', 'bar', 'boo', 'baz'])
)