wrap($arrays->arrayOf($plugins->loadClass("java.lang.String"), "one", null, "three", "four", null)); // 将非空字符串转换为其长度，并添加索引信息, 带索引的非空字符串长度: [0_3, 2_5, 3_4] $data->mapIndexedNotNull(function ($index, $word) use ($objectWrappers) { if ($word != null) return $index . "_" . $objectWrappers->wrap($word)->count(); else return null; })->forEach(function ($it) use ($console) { $console->log($it); });