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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