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Re: Re: Perl Functionality in Java

by djantzen (Priest)
on Nov 08, 2002 at 14:20 UTC ( #211434=note: print w/replies, xml ) Need Help??

in reply to Re: Perl Functionality in Java
in thread Perl Functionality in Java

Okay, I've got a major improvement on this. Rather than forcing the user to handle iteration through the loop and to compile the return list -- making this implementation of highly dubious value over a normal 'for' loop -- we define an abstract superclass from which to inherit rather an interface to implement:

public abstract static class MapBlock { public Object[] run(Object[] list) { Object[] out = new Object[list.length]; // begin loop through list for (int i = 0; i < list.length; i++) { // call processElement on ourself and collect element return +ed Object new_obj = this.processElement(list[i]); out[i] = new_obj; } return out; } public abstract Object processElement(Object obj); // This might alternatively return an Object array for greater fle +xibility. // 'run' would require slight alterations to deal with an array co +ming back. // Thanks for the idea to [jdporter] }

The original definition of map remains the same. Then below, we can simplify the anonymous class to the point where this is really starting to look like map!

Object[] new_list = map(new MapBlock() { public Object processElement(Object obj) { String str = (String)obj; return str.toUpperCase(); } }, objects); // end of MapBlock, second param objects

It's times like these I say booyah! ; )

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