Even with a small loop like that there are potential problems. Should there be an 'else'? You might know because you wrote it, but the compiler/runtime doesn't

Even with a small loop like that there are potential problems. Should there be an 'else'? You might know because you wrote it, but the compiler/runtime doesn't, and neither do other programmers on your team without taking time to analyse your intention. Using map/reduce/filter/etc. is declarative and less likely to result in spurious errors. That's the benefit of this declarative approach, it removes the relentless boilerplate, works solely with intent, and reduces cyclomatic complexity.