RosettaCodeData/Task/Remove-lines-from-a-file/Sidef/remove-lines-from-a-file.sidef

func remove_lines(file, beg, len) {
    var lines = file.open_r.lines;
    lines.splice(beg, len).len == len || warn "Too few lines";
    file.open_w.print(lines.join)
}

remove_lines(File(__FILE__), 2, 3);