samples/lines.js

/*
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var Files = java.nio.file.Files;
var File = java.io.File;
var d = arguments.length == 0? "." : arguments[0];

// print total number of lines in all .java files under a
// given directory (recursively)

print(Files.walk(new File(d).toPath()).
  filter(function(p) p.toString().endsWith(".java")).
  mapToInt(function(p) Files.lines(p).count()).sum())