Because I really have come to hate for loops, here is one in Javascript which uses a fixed point combinator to do the looping and filtering of the list.
function (orig, i, acc) {
if (i > orig.length) return acc;
if (orig[i] != "") acc[acc.length] = orig[i];
return arguments.callee(orig, (i + 1), acc);
}(" one two three four ".split(" ").reverse(), 0, []).join(" ")
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