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# PBS 50 of x — A Worked Example (Object Explorer)

Filed Under Computers & Tech, Software Development on February 18, 2018 at 6:35 pm

- PBS 1 of X – Introduction
- PBS 2 of X – Introducing HTML
- PBS 3 of X – HTML Block Elements
- PBS 4 of X – HTML In-line Elements
- PBS 5 of X – Images & Links
- PBS 6 of X – Introducing CSS
- PBS 7 of X – More CSS
- PBS 8 of X – CSS Positioning
- PBS 9 of X – More CSS Positioning
- PBS 10 of X – Yet More CSS
- PBS 11 of X – Tables
- PBS 12 of X – Introducing JavaScript
- PBS 13 of X – JS Conditionals
- PBS 14 of X – JS Loops & Arrays
- PBS 15 of X – JS Functions
- PBS 16 of X – JS Callbacks
- PBS 17 of X – JS Objects
- PBS 18 of X – JS Miscellany
- PBS 19 of X – Some JavaScript Challenges
- PBS 20 of X – JS in the Browser
- PBS 21 of X – jQuery Basics
- PBS 22 of X – jQuery Events
- PBS 23 of x – Creating Elements with jQuery
- PBS 24 of x – Creating a JavaScript API
- PBS 25 of x – A Case Study (bartificer.linkToolkit.js)
- PBS 26 of x – HTML Data Attributes with jQuery
- PBS 27 of x – JS Prototype Revision | HTML Forms
- PBS 28 of x – JS Prototype Revision | CSS Attribute Selectors & Buttons
- PBS 29 of x – JS Prototype Revision | Glyph Icons
- PBS 30 of x – Comparing JS Objects | Introducing WAI-ARIA
- PBS 31 of x – JS Static Functions | Checkboxes & Radio Buttons
- PBS 32 of x – JS Error Handling Revision | HTML Selects
- PBS 33 of x – JS Testing with QUnit
- PBS 34 of x – More JS Testing with QUnit
- PBS 35 of x – HTML Text Input | Introducing ‘Life’
- PBS 36 of x – More HTML Text Input | More Cellular Automata
- PBS 37 of x – JSDoc Demo
- PBS 38 of x – Taking Stock
- PBS 39 of x – HTML5 Form Validation
- PBS 40 of x – HTML5 Custom Validations with jQuery
- PBS 41 of x – Form Events
- PBS 42 of x – Playing the Game of Life
- PBS 43 of x – Introducing JavaScript ES6
- PBS 44 of x – ES6 Arguments & Objects
- PBS 45 of x – ES6 Arrays & Strings
- PBS 46 of x – ES6 Spread Operator, Arrow Functions & Classes
- PBS 47 of x – ES6 Polymorphism
- PBS 48 of x – A Closer Look at ‘this’ and ‘static’
- PBS 49 of x — Improving Our Cellular Automata
- PBS 50 of x — A Worked Example (Object Explorer)
- PBS 51 of x — Cellular Automata Wrap-up
- PBS 52 of X — Introducing Bootstrap 4
- PBS 53 of X — Bootstrap Utilities
- PBS 54 of X — More Bootstrap Utilities
- PBS 55 of X — Bootstrap Content
- PBS 56 of X — More Bootstrap Content
- PBS 57 of X — The Bootstrap Grid
- PBS 58 of X — Bootstrap Breakpoints
- PBS 59 of X — More Bootstrap Breakpoints
- PBS 60 of X — Bootstrap & jQuery
- PBS 61 of X — Bootstrap Jumbotrons & Badges
- PBS 62 of X — A Basic Bootstrap Form
- PBS 63 of X — Bootstrap Buttons
- PBS 64 of X — Bootstrap Form Layouts
- PBS 65 of X — Bootstrap Input Groups
- PBS 66 of X — Bootstrap Form Validation
- PBS 67 of X — Introducing Bootstrap Dropdowns
- PBS 68 of X — Bootstrap Navs
- PBS 69 of X — Bootstrap Navbars

In this very special 50th instalment I share my screen with Allison and we build up a simple web app together. We start with the scariest thing of all, a blank screen, and take it from there.

The web app we build up together is an object visualiser. Our simple web app consists of a text area into which we can enter JavaScript code to define an object, a `<div>`

into which we will render a representation of the object, and a button to trigger the rendering.

Using a Screen Reader? click here.

Just about everything we use in this little exercise is revision, with one exception — we meet JavaScript’s `eval()`

function for the first time. The `eval()`

function takes as an argument a string, and executes it as JavaScript code. For more details, see the MDN documentation.

You can download the final code here.

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