So, what is an object? Well, it is a set of name/value pairs. Everything else-functions, arrays, and regular expressions, as well as all the other objects you use in your program-those are all variant kinds of objects. The only things that are really primitives are strings, numbers, and booleans a couple of ways of saying “can’t find it,” and objects. However, most of these are not actually primitive types. These are the common JavaScript types-these are everything you can actually type into your source code.
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This is a big topic and we’re going to cover a lot of ground. Finally, we’ll delve into the inner workings of the instanceof keyword, before closing with a look at future directions, a tool for exploring these concepts further, and my recommendations. We’ll discuss classes and instantiation in the prototypal model, then see how these concepts map to the classical model most people use. Next, we’ll cover prototypes and inheritance, then polymorphism and method overriding. We’ll start with a review of object fundamentals, then look at how functions work in JavaScript. In today’s episode, we’re going to build up these recipes from first principles. I’m here with my Lessons Learned on object-oriented programming in JavaScript. My name is James Shore and this is Let’s Code: Test-Driven JavaScript. But why this? Why this… mess? And why does it work? The standard way, so much as there can be a standard way, is this. This approach stresses the fact that geometrical constructions are abstract, formal procedures and not figures.If you hang around the JavaScript world long enough, you’ll come across a bunch of different recipes for object-oriented programming. In GCLC, figures are described rather than drawn. GCLC is a dynamic geometry tool for visualizing and teaching geometry, and for producing mathematical illustrations. Geo, for the Squeak/ Smalltalk environment.
Geo is a GPL interactive software intended for younger students (7-15).
Full documentation is available online.ĭr Genius was an attempt to merge Dr. Also, it now supports macros, line segments, calculations, arbitrary functions, plots, etc. The later version Cinderella.2 also includes a physics simulation engine and a scripting language. Derived from C.a.R., it provides a different user interface.Ĭinderella, written in Java, is very different from The Geometer's Sketchpad. is a free GPL analog of The Geometer's Sketchpad (GSP), written in Java.Ĭabri was developed by the French school of mathematics education in Grenoble (Laborde, 1993)ĬaRMetal is a free GPL software written in Java. Measurement and calculation features related to IGS: (TODO) We detail here the proof related features.
Sequences, 2D & 3D, human readable file formatįunctions & function plots, symbolic differentiation, mathematical notationįolding, cutting, taping, marker, and working instrument models.Ĭollaborative sessions over the internet.įeatures related to macro constructions: (TODO) Website for exported HTML5 Canvas and JavaScript Interactive Apps (Euclid's Muse).
Symbolic calculations, which can be copied as input for CAS, TeX, and source code in 21 formats/languages. Interactive proof, diagram checking, teacher/student models, labels with dynamic placeholders The following table provides a more detailed comparison :ĢD and 3D, projective and conformal, Geometric Algebra.
Windows, Linux, Mac OS X, Android, iOS, Windows RT
The following table provides a first comparison of the different software according to their license and platform. For a related, comparative physical example of these algorithms, see Lenart Sphere. Nearly all of the following programs are DGEs. The main example of a supposer is the Geometric Supposer, which does not have draggable objects, but allows students to study pre-defined shapes. Most are DGEs: software that allows the user to manipulate ("drag") the geometric object into different shapes or positions. There are three main types of computer environments for studying school geometry: supposers, dynamic geometry environments (DGEs) and Logo-based programs. This was soon followed by Cabri in 1986 and The Geometer's Sketchpad. The earliest IGS was the Geometric Supposer, which was developed in the early 1980s.