Angular: Resolvendo navegação onTop em componentes

Um dos problemas que são comuns no Angular é a restauração da navegação na posição onde o usuário partiu no componente anterior. Isto muitas vezes
causam problemas de navegação. A forma mais fácil de resolver isto é adicionando no componente que será carregado o parametrô abaixo:


ngAfterViewInit() {
window.scrollTo(0, 0);
}

Quais os produtos que mais vendem no Mercado Livre ?

O Mercado Livre divulgou rescentemente em um evento a lista dos produtos que mais vendem no Market Place. Quer vender mais na web ? então de uma olhadinha na lista abaixo:

  1. celulares e smartphones;
  2. capinhas e suportes para celulares;
  3. sapatos, sandálias e sapatilhas;
  4. camisas, camisetas e blusas;
  5. cartão de memória;
  6. lembrancinha de festas;
  7. reprodutores de música MP3, MP4 e MP5;
  8. câmeras digitais;
  9. pen drives;
  10. relógios;
  11. cartuchos de tinta;
  12. perfumes;
  13. jogos para playstation;
  14. tablets;
  15. impressoras.

Produtos mais procurados no site:

  1. relógios masculinos;
  2. vestidos femininos;
  3. roupas femininas;
  4. bolsas femininas;
  5. carros usados;
  6. caminhões usados;
  7. blusas femininas;
  8. sandálias femininas;
  9. tênis masculino;
  10. conjuntos femininos;
  11. sapatilha feminina;
  12. armário de cozinha;
  13. sapatênis masculino;
  14. body feminino;
  15. moletom feminino;
  16. sapatênis feminino;
  17. cortinas para sala;
  18. relógio feminino;
  19. calças femininas;
  20. macacão feminino;
  21. tênis feminino;
  22. chuteiras de campo;
  23. perfumes importados;
  24. camisas masculinas;
  25. poltronas decorativas;
  26. moletom masculino;
  27. shorts feminino;
  28. l200 triton savana 4×4 3;
  29. carros antigos;
  30. sapatos femininos;
  31. casacos femininos;
  32. vestidos evangélicos;
  33. lustre pendente;
  34. maleta de maquiagem;
  35. relógio invicta;
  36. macaquinho feminino;
  37. blusa de frio feminina;
  38. cropped;
  39. óculos feminino;
  40. kit de ferramentas.

Graduação em Ciência da Computação Open Source

O OSSU ( Open Source Society University ) é uma organização feita por desenvolvedores do mundo inteiro no qual traz como iniciativa cursos e conteúdos online de ciências da computação para graduação. Há conteúdos do MIT, Stanfort entre diversas outras faculdades renomadas

Artigo em inglês

Open Source Society University

Path to a free self-taught education in Computer Science!

Awesome Open Source Society University - Computer Science Contribute with OSSU on Patreon

Contents

Summary

The OSSU curriculum is a complete education in computer science using online materials. It’s not merely for career training or professional development. It’s for those who want a proper, well-rounded grounding in concepts fundamental to all computing disciplines, and for those who have the discipline, will, and (most importantly!) good habits to obtain this education largely on their own, but with support from a worldwide community of fellow learners.

It is designed according to the degree requirements of undergraduate computer science majors, minus general education (non-CS) requirements, as it is assumed most of the people following this curriculum are already educated outside the field of CS. The courses themselves are among the very best in the world, often coming from Harvard, Princeton, MIT, etc., but specifically chosen to meet the following criteria.

Courses must:

  • Be open for enrollment
  • Run regularly (ideally in self-paced format, otherwise running at least once a month or so)
  • Fulfill the academic requirements of OSSU
  • Fit neatly into the progression of the curriculum with respect to topics and difficulty level
  • Be of generally high quality in teaching materials and pedagogical principles

When no course meets the above criteria, the coursework is supplemented with a book. When there are courses or books that don’t fit into the curriculum but are otherwise of high quality, they belong in extras/courses or extras/readings.

Organization. The curriculum is designed as follows:

  • Intro CS: for students to try out CS and see if it’s right for them
  • Core CS: corresponds roughly to the first three years of a computer science curriculum, taking classes that all majors would be required to take
  • Advanced CS: corresponds roughly to the final year of a computer science curriculum, taking electives according to the student’s interests
  • Final Project: a project for students to validate, consolidate, and display their knowledge, to be evaluated by their peers worldwide
  • Pro CS: graduate-level specializations students can elect to take after completing the above curriculum if they want to maximize their chances of getting a good job

Duration. It is possible to finish Core CS within about 2 years if you plan carefully and devote roughly 18-22 hours/week to your studies. Courses in Core CS should be taken linearly if possible, but since a perfectly linear progression is rarely possible, each class’s prerequisites is specified so that you can design a logical but non-linear progression based on the class schedules and your own life plans.

Cost. All or nearly all course material prior to Pro CS is available for free. However, some courses may charge money for assignments/tests/projects to be graded. Note that Coursera offers financial aid. Decide how much or how little to spend based on your own time and budget; just remember that you can’t purchase success!

Process. Students can work through the curriculum alone or in groups, in order or out of order.

  • For grouping up, please use the cohorts repository to find or create a cohort suited to you.
  • We recommend doing all courses in Core CS, only skipping a course when you are certain that you’ve already learned the material previously.
  • For simplicity, we recommend working through courses (especially Core CS) in order from top to bottom, as they have already been topologically sorted by their prerequisites.
  • Courses in Advanced CS are electives. Choose one subject (e.g. Advanced programming) you want to become an expert in, and take all the courses under that heading. You can also create your own custom subject, but we recommend getting validation from the community on the subject you choose.

Content policy. If you plan on showing off some of your coursework publicly, you must share only files that you are allowed to. Do NOT disrespect the code of conduct that you signed in the beginning of each course!

How to contribute. Please see CONTRIBUTING.

Getting help. Please check our Frequently Asked Questions, and if you cannot find the answer, file an issue or talk to our friendly community!

Curriculum

Curriculum version8.0.0 (see CHANGELOG)


Prerequisites

  • Core CS assumes the student has already taken high school math and physics, including algebra, geometry, and pre-calculus. Some high school graduates will have already taken AP Calculus, but this is usually only about 3/4 of a college calculus class, so the calculus courses in the curriculum are still recommended.
  • Advanced CS assumes the student has already taken the entirety of Core CS and is knowledgeable enough now to decide which electives to take.
  • Note that Advanced systems assumes the student has taken a basic physics course (e.g. AP Physics in high school).

Introduction to Computer Science

This course will introduce you to the world of computer science.

Topics coveredcomputation imperative programming basic data structures and algorithms and more

CoursesDurationEffortPrerequisites
Introduction to Computer Science and Programming using Python9 weeks15 hours/weekhigh school algebra

Core CS

All coursework under Core CS is required, unless otherwise indicated.

Core programming

Topics coveredfunctional programming design for testing program requirements common design patterns unit testing object-oriented design Java static typing dynamic typing ML-family languages (via Standard ML)Lisp-family languages (via Racket) Ruby and more

CoursesDurationEffortPrerequisites
How to Code – Simple Data7 weeks8-10 hours/weeknone
How to Code – Complex Data6 weeks8-10 hours/weekHow to Code: Simple Data
Software Construction – Data Abstraction6 weeks8-10 hours/weekHow to Code – Complex Data
Software Construction – Object-Oriented Design6 weeks8-10 hours/weekSoftware Construction – Data Abstraction
Programming Languages, Part A4 weeks8-16 hours/weekrecommended: Java, C
Programming Languages, Part B3 weeks8-16 hours/weekProgramming Languages, Part A
Programming Languages, Part C3 weeks8-16 hours/weekProgramming Languages, Part B

Readings

Core math

Topics coveredlinear transformations matrices vectors mathematical proofs number theory differential calculus integral calculus sequences and series discrete mathematics basic statistics O-notation graph theory vector calculus discrete probability and more

CoursesDurationEffortPrerequisites
Essence of Linear Algebrapre-calculus
Linear Algebra – Foundations to Frontiers (alt)15 weeks8 hours/weekEssence of Linear Algebra
Calculus 1A: Differentiation13 weeks6-10 hours/weekpre-calculus
Calculus 1B: Integration13 weeks5-10 hours/weekCalculus 1A
Calculus 1C: Coordinate Systems & Infinite Series13 weeks5-10 hours/weekCalculus 1B
Mathematics for Computer Science113 weeks5 hours/weekCalculus 1C

1: Students struggling with MIT Math for CS can consider taking the Discrete Mathematics Specialization first. It is more interactive but less comprehensive, and it costs money to unlock full interactivity.

Core systems

Skip to the second course (Nand2Tetris) when the first course (CS50) moves away from C. (Why?)

Topics coveredprocedural programming manual memory management boolean algebra gate logic memorycomputer architecture assembly machine language virtual machines high-level languages compilersoperating systems network protocols and more

CoursesDurationEffortPrerequisites
Introduction to Computer Science – CS50 (alt)12 weeks10-20 hours/weekintroductory programming
Build a Modern Computer from First Principles: From Nand to Tetris (alt)6 weeks7-13 hours/weekC-like programming language
Build a Modern Computer from First Principles: Nand to Tetris Part II6 weeks12-18 hours/weekone of these programming languages, From Nand to Tetris Part I
Introduction to Computer Networking8 weeks4–12 hours/weekalgebra, probability, basic CS
ops-class.org – Hack the Kernel15 weeks6 hours/weekalgorithms

Readings

Core theory

Topics covereddivide and conquer sorting and searching randomized algorithms graph search shortest paths data structures greedy algorithms minimum spanning trees dynamic programming NP-completeness and more

CoursesDurationEffortPrerequisites
Algorithms: Design and Analysis, Part I8 weeks4-8 hours/weekany programming language, Mathematics for Computer Science
Algorithms: Design and Analysis, Part II8 weeks4-8 hours/weekPart I

Core applications

Topics coveredAgile methodology REST software specifications refactoring relational databasestransaction processing data modeling neural networks supervised learning unsupervised learning OpenGLraytracing block ciphers authentication public key encryption and more

CoursesDurationEffortPrerequisites
Databases12 weeks8-12 hours/weeksome programming, basic CS
Machine Learning11 weeks4-6 hours/weeklinear algebra
Computer Graphics6 weeks12 hours/weekC++ or Java, linear algebra
Cryptography I6 weeks5-7 hours/weeklinear algebra, probability
Software Engineering: Introduction6 weeks8-10 hours/weekSoftware Construction – Object-Oriented Design
Software Development Capstone Project6-7 weeks8-10 hours/weekSoftware Engineering: Introduction

Advanced CS

After completing every required course in Core CS, students should choose a subset of courses from Advanced CS based on interest. Not every course from a subcategory needs to be taken. But students should take every course that is relevant to the field they intend to go into.

The Advanced CS study should then end with one of the Specializations under Advanced applications. A Specialization’s Capstone, if taken, may act as the Final project, if permitted by the Honor Code of the course. If not, or if a student chooses not to take the Capstone, then a separate Final project will need to be done to complete this curriculum.

Advanced programming

Topics covereddebugging theory and practice goal-oriented programming GPU programming CUDA parallel computing object-oriented analysis and design UML large-scale software architecture and design and more

CoursesDurationEffortPrerequisites
Compilers9 weeks6-8 hours/weeknone
Software Debugging8 weeks6 hours/weekPython, object-oriented programming
Software Testing4 weeks6 hours/weekPython, programming experience
LAFF – On Programming for Correctness7 weeks6 hours/weeklinear algebra
Introduction to Parallel Programming (alt)12 weeksC, algorithms
Software Architecture & Design8 weeks6 hours/weeksoftware engineering in Java

Advanced math

Topics coveredparametric equations polar coordinate systems multivariable integrals multivariable differentials probability theory and more

CoursesDurationEffortPrerequisites
Multivariable Calculus13 weeks12 hours/weekMIT Calculus 1C
Introduction to Probability – The Science of Uncertainty18 weeks12 hours/weekMultivariable Calculus

Advanced systems

Topics covereddigital signaling combinational logic CMOS technologies sequential logic finite state machines processor instruction sets caches pipelining virtualization parallel processing virtual memorysynchronization primitives system call interface and more

CoursesDurationEffortPrerequisites
Reliable Distributed Systems, Part 15 weeks5 hours/weekScala, intermediate CS
Reliable Distributed Systems, Part 25 weeks5 hours/weekPart 1
Electricity and Magnetism, Part 117 weeks8-10 hours/weekcalculus, basic mechanics
Electricity and Magnetism, Part 27 weeks8-10 hours/weekElectricity and Magnetism, Part 1
Computation Structures 1: Digital Circuits10 weeks6 hours/weekelectricity, magnetism
Computation Structures 2: Computer Architecture10 weeks6 hours/weekComputation Structures 1
Computation Structures 3: Computer Organization10 weeks6 hours/weekComputation Structures 2

1 Note: These courses assume knowledge of basic physics. (Why?) If you are struggling, you can find a physics MOOC or utilize the materials from Khan Academy: Khan Academy – Physics

Advanced theory

Topics coveredformal languages Turing machines computability event-driven concurrency automatadistributed shared memory consensus algorithms state machine replication computational geometry theorypropositional logic relational logic Herbrand logic concept lattices game trees and more

CoursesDurationEffortPrerequisites
Introduction to Logic10 weeks4-8 hours/weekset theory
Automata Theory7 weeks10 hours/weekdiscrete mathematics, logic, algorithms
Computational Geometry16 weeks8 hours/weekalgorithms, C++
Introduction to Formal Concept Analysis6 weeks4-6 hours/weeklogic, probability
Game Theory8 weeksx hours/weekmathematical thinking, probability, calculus

Advanced applications

These Coursera Specializations all end with a Capstone project. Depending on the course, you may be able to utilize the Capstone as your Final Project for this Computer Science curriculum. Note that doing a Specialization with the Capstone at the end always costs money. So if you don’t wish to spend money or use the Capstone as your Final, it may be possible to take the courses in the Specialization for free by manually searching for them, but not all allow this.

CoursesDurationEffortPrerequisites
Robotics (Specialization)26 weeks2-5 hours/weeklinear algebra, calculus, programming, probability
Data Mining (Specialization)30 weeks2-5 hours/weekmachine learning
Big Data (Specialization)30 weeks3-5 hours/weeknone
Internet of Things (Specialization)30 weeks1-5 hours/weekstrong programming
Cloud Computing (Specialization)30 weeks2-6 hours/weekC++ programming
Full Stack Web Development (Specialization)27 weeks2-6 hours/weekprogramming, databases
Data Science (Specialization)43 weeks1-6 hours/weeknone
Functional Programming in Scala (Specialization)29 weeks4-5 hours/weekOne year programming experience

Final project

OSS University is project-focused. You are encouraged to do the assignments and exams for each course, but what really matters is whether you can use your knowledge to solve a real world problem.

After you’ve gotten through all of Core CS and the parts of Advanced CS relevant to you, you should think about a problem that you can solve using the knowledge you’ve acquired. Not only does real project work look great on a resume, but the project will also validate and consolidate your knowledge. You can create something entirely new, or you can find an existing project that needs help via websites like CodeTriage or First Timers Only.

Another option is using the Capstone project from taking one of the Specializations in Advanced applications; whether or not this makes sense depends on the course, the project, and whether or not the course’s Honor Code permits you to display your work publicly. In some cases, it may not be permitted; do not violate your course’s Honor Code!

Put the OSSU-CS badge in the README of your repository! Open Source Society University - Computer Science

  • Markdown: [![Open Source Society University - Computer Science](https://img.shields.io/badge/OSSU-computer--science-blue.svg)](https://github.com/ossu/computer-science)
  • HTML: <a href="https://github.com/ossu/computer-science"><img alt="Open Source Society University - Computer Science" src="https://img.shields.io/badge/OSSU-computer--science-blue.svg"></a>

Evaluation

Upon completing your final project, submit your project’s information to PROJECTS via a pull request and use our community channels to announce it to your fellow students.

Your peers and mentors from OSSU will then informally evaluate your project. You will not be “graded” in the traditional sense — everyone has their own measurements for what they consider a success. The purpose of the evaluation is to act as your first announcement to the world that you are a computer scientist and to get experience listening to feedback — both positive and negative — and taking it in stride.

The final project evaluation has a second purpose: to evaluate whether OSSU, through its community and curriculum, is successful in its mission to guide independent learners in obtaining a world-class computer science education.

Cooperative work

You can create this project alone or with other students! We love cooperative work! Use our channels to communicate with other fellows to combine and create new projects!

Which programming languages should I use?

My friend, here is the best part of liberty! You can use any language that you want to complete the final project.

The important thing is to internalize the core concepts and to be able to use them with whatever tool (programming language) that you wish.

Pro CS

After completing the requirements of the curriculum above, you will have completed the equivalent of a full bachelor’s degree in Computer Science, or quite close to one. You can stop in the Advanced CS section, but the next step to completing your studies is to develop skills and knowledge in a specific domain. Many of these courses are graduate-level.

Choose one or more of the following specializations:

These aren’t the only specializations you can choose. Check the following websites for more options:

Where to go next?

  • Look for a job as a developer!
  • Check out the readings for classic books you can read that will sharpen your skills and expand your knowledge.
  • Join a local developer meetup (e.g. via meetup.com).
  • Pay attention to emerging technologies in the world of software development:
    • Explore the actor model through Elixir, a new functional programming language for the web based on the battle-tested Erlang Virtual Machine!
    • Explore borrowing and lifetimes through Rust, a systems language which achieves memory- and thread-safety without a garbage collector!
    • Explore dependent type systems through Idris, a new Haskell-inspired language with unprecedented support for type-driven development.

keep learning

Code of conduct

OSSU’s code of conduct.

Community

  • Subscribe to our newsletter.
  • Use our forum if you need some help.
  • You can also interact through GitHub issues.
  • We also have a chat room! Join the chat at https://gitter.im/open-source-society/computer-science
  • Add Open Source Society University to your Linkedin profile!

PS: A forum is an ideal way to interact with other students as we do not lose important discussions, which usually occur in communication via chat apps. Please use our forum for important discussions.

How to show your progress

  1. Create an account in Trello.
  2. Copy this board to your personal account. See how to copy a board here.

Now that you have a copy of our official board, you just need to pass the cards to the Doing column or Done column as you progress in your study.

We also have labels to help you have more control through the process. The meaning of each of these labels is:

  • Main Curriculum: cards with that label represent courses that are listed in our curriculum.
  • Extra Resources: cards with that label represent courses that were added by the student.
  • Doing: cards with that label represent courses the student is current doing.
  • Done: cards with that label represent courses finished by the student. Those cards should also have the link for at least one project/article built with the knowledge acquired in such course.
  • Section: cards with that label represent the section that we have in our curriculum. Those cards with the Sectionlabel are only to help the organization of the Done column. You should put the Course’s cards below its respective Section’s card.

The intention of this board is to provide our students a way to track their progress, and also the ability to show their progress through a public page for friends, family, employers, etc. You can change the status of your board to be public or private.

Team

References

em Geral | 3,202 Palavras

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A OpinionBox efetuou uma pesquisa com 1.020 consumidores digitais em todo Brasil para uma pesquisa encomendada pela Paypal. A ideia era levantar o comportamento do mobile commerce no país. Com a pesquisa foi descoberto que os brasileiros costumam comprar qualquer tipo de produto pelo smartphone mas a categoria que mais se destaca é a de serviços como aplicativos de mobilidade urbana, locação de automóveis, delivery de comidas, carga de bilhete único e recarga de celulares contemplando 84% das respostas.

A categoria em que as carteiras digitais denominadas eWallets como Paypal são as mais citadas tendo um marketshare de 33% dos entrevistados. Em seguida o turismo com 32% e entretenimento com 25%. Os números só não são maiores por que 57% dos entrevistados ainda se preocupam em baixar apps pois se preocupam com o armazenamento do celular.

A necessidade de plataformas de mobile commerce mais eficientes é uma necessidade para este mercado. A startup Mobisale é uma plataforma de mobile commerce white label com aplicativos extremamente leves e que não ocupam espaço no celular do usuário. Esta pode ser uma solução para aqueles que querem aumentar a taxa de conversão e engajamento com os usuários para seus e-commerces.