Refactoring Legacy JavaScript Code to Use Classes: The Good, The Bad and The Ugly

JavaScript systems are becoming increasingly complex and large. To tackle the challenges involved in implementing these systems, the language is evolving to include several constructions for programming- in-the-large. For example, although the language is prototype-based, the latest JavaScript standard, named ECMAScript 6 (ES6), provides native support for implementing classes. Even though most modern web browsers support ES6, only a very few applications use the class syntax. In this paper, we analyze the process of migrating structures that emulate classes in legacy JavaScript code to adopt the new syntax for classes introduced by ES6. We apply a set of migration rules on eight legacy JavaScript systems. In our study, we document: (a) cases that are straightforward to migrate (the good parts); (b) cases that require manual and ad-hoc migration (the bad parts); and (c) cases that cannot be migrated due to limitations and restrictions of ES6 (the ugly parts). Six out of eight systems (75%) contain instances of bad and/or ugly cases. We also collect the perceptions of JavaScript developers about migrating their code to use the new syntax for classes.Comment: Paper accepted at 16th International Conference on Software Reuse (ICSR), 2017; 16 page

PENERAPAN ROBOT LENGAN SEBAGAI PENYELEKSI OBJEK BERBENTUK LINGKARAN BERDASARKAN WARNA MENGGUNAKAN KAMERA BERBASIS ATMEGA328

Proses penyeleksian suatu produk merupakan pekerjaan yang dilakukan secara berulang-ulang sehingga dapat menimbulkan rasa membosankan bagi manusia. Pekerjaan yang berulang-ulang akan lebih efektif apabila menggunakan otomasi. Salah satu bentuk dari otomasi tersebut adalah menggunakan robot berlengan. Robot berlengan dapat digunakan menggantikan posisi manusia dalam proses penyeleksian suatu produk. Robot berlengan bekerja berdasarkan instruksi yang diberikan pada sebuah mikrokontroller seperti mengambil benda dan meletakkannya pada suatu tempat sesuai dengan perintah yang telah diberikan. Pada penelitian ini robot berlengan 6 DOF digunakan untuk menyeleksi objek lingkaran berdasarkan warna merah, hijau dan biru menggunakan Webcam. Metode yang dipakai dalam proses penyeleksian adalah Shape dan Color Detection. Menggerakkan robot lengan untuk memindahkan objek digunakan sebuah metode inverse kinematik yang telah di program kedalam mikrokontroller. Jenis mikrokontroller yang digunakan adalah ATMega328. Ketika objek telah diketahui berbetuk lingkaran dan mengandung warna merah, hijau atau biru, maka robot lengan akan mengambil objek tersebut dan akan meletakakkan objek kedalam wadah sesuai dengan warna objek. Percobaan dilakukan sebanyak 100 kali dengan percobaan pada objek berwarna merah sebanyak 33 kali, objek warna hijau 33 kali dan objek warna biru sebanyak 34 kali. Tingkat kesalahan penyeleksian tertinggiadalah pada warna hijau yaitu 7 kali, disusul oleh warna merah 6 kali dan warna biru 5 kali

The experiences of the International Institute of Islamic Civilization & Malay World (ISTAC)in empowering the Malay World and Islamic Civilization

Although Indonesia and Malaysia are now two independent nations, both countries have a lot in common, tied by a common religion, language and cultural heritage dating back centuries ago. In building a better tomorrow, both nations can benefit from each other’s rich experiences. This paper will focus on an educational institute established at the International Islamic University (henceforth, IIUM) in 2016 initially named the Centre for Malay World and Islamic Civilization and now has been transformed as the International Institute of Islamic Civilization & Malay World (henceforth, ISTAC). The institute is established to support the efforts of the university in creating an academic and intellectual field of research and studies focusing on the Malay World and Islamic civilization. This study describes the scope, major types of activities and concerns of the institute. In so doing it will identify the potential areas for collaboration (such as academic exchange, research, international conferenc

Towards automated support for extraction of reusable components

A cost effective introduction of software reuse techniques requires the reuse of existing software developed in many cases without aiming at reusability. This paper discusses the problems related to the analysis and reengineering of existing software in order to reuse it. We introduce a process model for component extraction and focus on the problem of analyzing and qualifying software components which are candidates for reuse. A prototype tool for supporting the extraction of reusable components is presented. One of the components of this tool aids in understanding programs and is based on the functional model of correctness. It can assist software engineers in the process of finding correct formal specifications for programs. A detailed description of this component and an example to demonstrate a possible operational scenario are given

Analisa Pengaruh Aliran Fluida Yang Ditimbulkan Oleh Gerakan Putaran Propeller Pada Kapal Ikan Terhadap Tekanan Propeller Dengan Pendekatan Cfd

Dalam operasinya dilaut, suatu kapal harus memiliki kemampuan untuk mempertahankan kecepatan dinas (Vs) seperti yang direncanakan. Hal ini mempunyai arti bahwa, kapal haruslah mempunyai rancangan sistem propulsi yang dapat mengatasi keseluruhan gaya-gaya hambat yang terjadi agar memenuhi standar kecepatan dinasnya. Penelitian untuk meningkatkan daya dorong propeller dari tahun ketahun terus dilakukan dengan meningkatakan efisiensi propeller. Tapi dari sisi lain USAha untuk meneliti dimana konsentrasi tegangan yang diakibatkan daya dorong propeller masih kurang dilakukan Untuk tugas akhir ini analisa yang dilakukan adalah untuk mengetahui distribusi tekanan pada propeller dan juga maximum stress yang terjadi pada propeller. Proses pembuatan model geometri dibantu dengan menggunakan software CAD dan analisanya dilakukan dengan mengunakan pendekatan CFD (Computational Fluid Dynamic) sebagai sarana visualisasi.Analisa dilakukan dengan memvariasikan putaran propeller pada 100, 200, 300, 400, 500 rpm. Berdasarkan hasil perhitungan dan hasil running software CFD yang telah dilakukan didapatkan hasil perbedaan tekanan dimana pada tiap putarannya semakin meningkat. Tekanan paling besar terjadi pada putaran 500 rpm yaiutu sebesar 28169,72 N. Dengan menggunakan software MSC NASTRAN didapatkan nilai maksimum strees sebesar 13,1 N/mm2 akan tetapi material ini masih dalam batas aman karena hasil perhitungan safety factor material bahan didapat nilai 33,87

The potentials of henna (Lawsonia inamis L.) leaves extracts as counter stain in gram staining reaction

The potentials of aqueous and ethanol extract solutions of the henna plant (Lawsonia inamis L.) leaves adopted as alternative counter stain in Gram staining reactions were studied. Different extracts were formulated into various staining solutions of different concentrations. The solutionswere modified with hydrogen peroxide, ferric chloride, potassium alum and potassium permanganate. These staining solutions were used to stain bacterial isolates of Lactobacillus spp and Escherichia coli strains. The experimental henna plant extracts solutions were used with usualcounter stains (neutral red, safranin and dilute carbol fuchsin) as positive controls. The result obtained showed that aqueous extracts (cold and hot) oxidized with potassium permanganate with neutral pH gives a better staining reaction. While the ethanol extract after oxidized with potassiumpermanganate had no staining reaction. The result obtained therefore implied that the aqueous henna leaves extracts (cold or hot) when oxidized with potassium permanganate can be a substitute to the usual counter stains used in Gram staining reactions.Keywords: Aqueous Extract, Dyes, Henna, Counter-Stainin

Protein based molecular markers provide reliable means to understand prokaryotic phylogeny and support Darwinian mode of evolution

The analyses of genome sequences have led to the proposal that lateral gene transfers (LGTs) among prokaryotes are so widespread that they disguise the interrelationships among these organisms. This has led to questioning of whether the Darwinian model of evolution is applicable to prokaryotic organisms. In this review, we discuss the usefulness of taxon-specific molecular markers such as conserved signature indels (CSIs) and conserved signature proteins (CSPs) for understanding the evolutionary relationships among prokaryotes and to assess the influence of LGTs on prokaryotic evolution. The analyses of genomic sequences have identified large numbers of CSIs and CSPs that are unique properties of different groups of prokaryotes ranging from phylum to genus levels. The species distribution patterns of these molecular signatures strongly support a tree-like vertical inheritance of the genes containing these molecular signatures that is consistent with phylogenetic trees. Recent detailed studies in this regard on the Thermotogae and Archaea, which are reviewed here, have identified large numbers of CSIs and CSPs that are specific for the species from these two taxa and a number of their major clades. The genetic changes responsible for these CSIs (and CSPs) initially likely occurred in the common ancestors of these taxa and then vertically transferred to various descendants. Although some CSIs and CSPs in unrelated groups of prokaryotes were identified, their small numbers and random occurrence has no apparent influence on the consistent tree-like branching pattern emerging from other markers. These results provide evidence that although LGT is an important evolutionary force, it does not mask the tree-like branching pattern of prokaryotes or understanding of their evolutionary relationships. The identified CSIs and CSPs also provide novel and highly specific means for identification of different groups of microbes and for taxonomical and biochemical studies