The Author – Bart Busschots
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Jan
6
PBS 47 of x – ES6 Polymorphism
Filed Under Software Development, Computers & Tech on January 6, 2018 | 2 Comments
In this instalment we’ll wrap up our look at new features added to JavaScript with the release of ES6. We haven’t come even close to looking at all the new features brought by ES6, instead, we’ve just looked at a curated selection of some of the most useful new features.
Thanks to the power of the new class syntax introduced as part of ES6, we can now learn about two really important object oriented concepts which I had previously been avoiding because of how horrible the old syntax was. What we’ll be looking at are the very closely related concepts of inheritance and polymorphism.
To illustrate the concepts, and to lay the ground work for this instalment’s challenge, we’ll be making our way through a worked example. You can find the code in this instalment’s ZIP file, which you can download here.
Dec
20
PBS 46 of x – ES6 Spread Operator, Arrow Functions & Classes
Filed Under Software Development, Computers & Tech on December 20, 2017 | 1 Comment
We’ll start this instalment by having a look at my sample solutions to the previous two instalments, and then we’ll move on to looking at three ES6 features, two of which are extremely significant. We’ll start by addressing an accidental oversight from the previous instalment when we looked at arrays. I had intended to cover the so-called spread operator together with Array.from() and the for...of loop, but it slipped mind. Once we’ve dealt with my little oversight we’ll introduce an entirely new type of function that removes the need for the const self = this kludge for callbacks. So-called arrow functions greatly simplify the use of callback in JavaScript, and in modern JavaScript, callbacks are everywhere!
Finally, we’ll make a start on my personal favourite new feature in ES6 — classes. This major change brings JavaScript into line with the other C-style languages, and, more importantly, into line with how most programmers are used to working. This takes JavaScript objects from weird esoteric things only those initiated into the JS cult can understand at a glance to intuitively understandable constructs. For those of you for whom JavaScript is your first language, classes will be nice, but for those of you coming to JavaScript form other languages, classes will be a blessed relief!
We’ll only be covering the basics of the class keyword in this instalment. In the next instalment we’ll take things up a notch when we finally explore the concept of polymorphism, the heart and soul of object oriented programming.
Dec
10
PBS 45 of x – ES6 Arrays & Strings
Filed Under Computers & Tech, Software Development on December 10, 2017 | 2 Comments
We’ll start this instalment be re-visting the question of when to use let and when to use const for variable declarations. My initial advice was to default to using let, but based on some great feedback from the the community, I’ve changed my mind, and will be defaulting to const going forward. I’ll explain why I changed my mind.
Next we’ll have a quick look at my sample solution to the challenge set at the end of the previous instalment, before moving on to some new material. Specifically, we’ll look at some of the ways in which ES6 has improved arrays and strings.
Nov
26
PBS 44 of x – ES6 Arguments & Objects
Filed Under Software Development, Computers & Tech on November 26, 2017 | 1 Comment
In the previous instalment we started our exploration of the new features ES6 brought to JavaScript with a look at block scoped variables. We learned that var will continue to work as it always has, defining function-scoped variables, but that we can now use let and const to define block-spoped variables and constants.
We’ll continue our exploration of ES6 today by looking at how function arguments have been improved, and learning about a new type of loop designed to make looping over object properties easier.
There is no ZIP file for this instalment, instead, I’ve published my solution to the challenge from the previous instalment (which is also the starting point for the next challenge) as a tagged release on GitHub. You can download it using the big green button labeled Clone or Download.
Nov
12
PBS 43 of x – Introducing JavaScript ES6
Filed Under Software Development, Computers & Tech on November 12, 2017 | 3 Comments
Because its been a while since we focused on JavaScript, the bulk of this instalment will focus on solving the challenge set at the end of the previous instalment. We’ll work through the solution in detail, step-by-step.
We’ll finish the instalment by making a start on moving from JavaScript version 5, to JavaScript version 6, or ECMAScript 6, usually just called ES6. When we started our look at JavaScript about a year and a half ago it made sense to use JavaScript 5, but now it’s time to upgrade our knowledge. ES6 was a very big change indeed, so we won’t bit it all off at once. Instead, we’ll focus on just one very important change in this instalment — ES6’s new take on variables.
There’s no zip file for this instalment as such, instead, I’ve published my sample solution as a tagged release on GitHub instead. You can use the big green clone or download button to either copy the code using GIT, or download it as a ZIP file.
Oct
29
PBS 42 of x – Playing the Game of Life
Filed Under Software Development, Computers & Tech on October 29, 2017 | 1 Comment
In this instalment it’s finally time to bring our Cellular Automaton prototypes to life by implementing Conway’s Game of Life. By the end of this instalment we’ll have reached a real milestone — our first web app! Granted, it won’t be a very feature-rich web app, but you have to start somewhere!
As usual, I’ve collected the code files for this instalment into a ZIP file which you can download here. As well as the ZIP file, I’ve also published a tagged release of the bartificer.ca.js code on GitHub which you’ll need for this instalment’s challenge.
Oct
13
PBS 41 of x – Form Events
Filed Under Software Development, Computers & Tech on October 13, 2017 | 1 Comment
In this instalment we’ll tie up the last few loose ends related to web forms. With web forms under our belts, we’ll then be ready to pick up where we left off with our cellular automata JavaScript prototypes, and combine our HTML, JavaScript, and CSS skills together to make our first web app – an implementation of Conway’s Game of Life.
This instalment breaks down into two distinct parts – our first look at keyboard interaction with web forms, and a final look at form-related events.
When it comes to keyboard interaction we’ll start by looking at how browsers treat regular web forms, and then we’ll move on to supporting keyboard interaction with custom web form UI elements like the star-rating example from instalment 36.
Finally, we’ll wrap up with a handy reference table summarising the most important webform-related JavaScripts events, giving some guidance on their use.
There’s just one sample file associated with this instalment, and it’s available for download as a ZIP file here.
Sep
29
PBS 40 of x – HTML5 Custom Validations with jQuery
Filed Under Computers & Tech, Software Development on September 29, 2017 | 3 Comments
At the end of the previous instalment I promised we were done with HTML form validation, and insisted we were ready to move on to finishing our Cellular Automata, but it turns out that was a little premature. While working on my sample solution for the previous instalment‘s challenge I realised I’d forgotten to cover something very important – the fact that you can use jQuery to deal with situations where the HTML5 form validation attributes are not powerful enough for your needs. So – we need to rectify that oversight, and that’s going to take this entire instalment to do.
Then, while doing her homework, Allison discovered another oversight that needs to be remedied before we move away from HTML forms – we need to look at how to support keyboard-only interactions. Why? In a word – accessibility. So, in the next instalment we’ll start by looking at the narrow case of supporting keyboard input in forms, but we’ll then move on and look at keyboard interactions a little more broadly, and we’ll learn how to add keyboard shortcuts to our web apps. This will come in useful when we do then finally move on to getting our cellular automata working the following instalment.
As usual, I’ve collected all the files for this instalment into a single ZIP file which you can download here.
Sep
15
PBS 39 of x – HTML5 Form Validation
Filed Under Software Development, Computers & Tech on September 15, 2017 | 2 Comments
In this instalment we’ll be taking a break from our parallel approach, and focusing almost exclusively on HTML5 form validation. We’ll dedicate the entirety of the next instalment to getting our cellular automaton prototypes up and running so we can actually ‘play’ the game of life.
While we won’t be continuing work on our Cellular Automata prototypes this time, I will share my solution to the challenge I set way back in instalment 36.
Also, before we get stuck into new content I’ll be taking a small diversion to explain a slight change in my approach to HTML coding, and how that will affect the sample code you see for the remainder of this series.
As usual, I’ve collected the example file for this instalment and the starting point for the challenge together into a ZIP file which you can download here.
Sep
1
PBS 38 of x – Taking Stock
Filed Under Computers & Tech, Software Development on September 1, 2017 | Leave a Comment
Since this is the first instalment back after our summer hiatus, it seems like a good time to pause and take stock. I want to look back to revise what we’ve learned to far, and, to look forward to where I want to take this series next.