ViGravitatis vs RubyLearn

The physics is fun! The law of gravity in particular. Explore it with ViGravitatis today and understand the trajectory of celestials tomorrow! Guide: Modes ViGravitatis provides two key modes: Creation and Simulation. In the Creation Mode, you have the full power to place anything in your space and anywhere. When you press Play, Simulation mode starts automatically. In this mode, you are limited to changing a few parameters of a selected celestial. Moreover, different capabilities are available when simulation is playing compared to when it is paused. Use the toggle with the hammer icon to switch between Creation and Simulation. Note that when you switch from Simulation to Creation, the space is reset to its initial state. Meaning that the positions and velocities of celestials are reset. The key scenario of using the app is to set up your scene in the Creation Mode and then check how it is changing during the simulation. Then, go back to Creation Mode, change a few initial parameters, and check again how it affects the simulation. Guide: Simulation Speed There are a few ways you can affect the speed of the simulation. First of all, it can be completely paused at any time. So, no objects are moving. But you can also change the accuracy of the simulation using the slider near the Play/Pause toggle. It can increase the speed of the simulation, sacrificing accuracy. So, at very high speeds, objects can start moving in a very surprising way, albeit inaccurately. On the other hand, you can change the “iterations count”. With greater iterations in total simulation runs, faster without any degradation in accuracy, but it will require more battery power of your device.

RubyLearn: Master Ruby Programming Learn Ruby through structured, practical tutorials designed for real-world development. RubyLearn helps you build a strong foundation in Ruby’s elegant, expressive, and object-oriented syntax, then progress to advanced topics such as testing, metaprogramming, and idiomatic Ruby techniques. Whether you are a beginner, a web developer, a backend engineer, or a Rails developer strengthening your core Ruby skills, RubyLearn provides a clear path from fundamentals to advanced concepts. TUTORIAL FEATURES • Clear explanations with practical examples • Code samples with syntax highlighting • Progressive lessons from beginner to advanced • Idiomatic Ruby techniques and best practices • Structured content for focused, self-paced learning LEARNING UNITS 1. Getting Started with Ruby Learn Ruby’s core philosophy, syntax, and development workflow. 2. Ruby Types and Variables Understand dynamic typing, variables, constants, symbols, strings, and numbers. 3. Ruby Control Structures Master conditionals, loops, iterators, and program flow. 4. Ruby Collections Work with arrays, hashes, ranges, sets, and Enumerable. 5. Ruby Methods and Blocks Explore methods, blocks, procs, lambdas, parameters, and return values. 6. Object-Oriented Programming I Learn classes, objects, inheritance, encapsulation, and polymorphism. 7. Object-Oriented Programming II Study modules, mixins, composition, method lookup, and advanced OOP patterns. 8. Ruby Standard Library Use essential built-in modules and classes for common development tasks. 9. Ruby Exception Handling Handle errors, raise exceptions, and build more reliable Ruby programs. 10. Testing with RSpec Write clear, maintainable tests for Ruby applications. 11. Advanced Ruby Collections Apply powerful Enumerable patterns and advanced collection techniques. 12. Ruby Metaprogramming Explore reflection, dynamic methods, hooks, and Ruby’s flexible object model. KEY FEATURES • 12 complete Ruby learning units • 100 focused lessons covering essential Ruby topics • 2,400 coding exercises, with 200 exercises per unit • 1,200 targeted flashcards across all 12 units • Daily coding challenges for consistent practice • Ruby cheatsheet for quick syntax and concept reference • Interactive exercise formats • Personal progress tracking • 12 interface themes • Support for 15 interface languages • Full offline access • Completely ad-free learning • Content improvements, bug fixes, and compatibility updates included WHO RUBYLEARN IS FOR • Beginning and intermediate Ruby developers • Web application developers • Backend and full-stack engineers • Rails developers strengthening their Ruby foundation • DevOps and automation professionals • Startup founders and technical builders • Developers transitioning from another programming language Build practical Ruby skills through clear explanations, focused practice, and structured progression. Start learning with RubyLearn and develop the knowledge needed to create elegant web applications, reliable backend systems, useful automation tools, and maintainable Ruby software.