Nov

15

PBS 86 of X — JavaScript Function Objects (Redux & Update)

Filed Under Computers & Tech, Software Development on November 15, 2019 | 1 Comment

This post is part 86 of 92 in the series Programming by Stealth

This is the third instalment in a mini-series within the PBS series looking at the many different roles objects fulfil in JavaScript. I’ve been describing these roles as hats, so up to this point we’ve looked at how JavaScript objects have a dictionary hat and an array hat. In future instalments we’ll see that JavaScript objects also have regular expression and string hats. Today though, we’ll start a two-part look at what is probably the most un-expected hat of all — the function hat. Yes, JavaScript uses objects to implement functions. That is to say, every JavaScript function is an object!

Because functions are so important, and because there is a lot of ground to cover, I’ve spread this topic over two instalments. This first instalment will be mostly (but not entirely) a redux, and most of the new content will be covered in the next instalment.

You can download this instalment’s ZIP file here (now via the JSDelivr CDN). If you prefer, you can access this instalment’s resources directly at the following links:

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Nov

3

PBS 85 of X — Objects as Arrays in JavaScript (Redux & Update)

Filed Under Computers & Tech, Software Development on November 3, 2019 | 3 Comments

This post is part 85 of 92 in the series Programming by Stealth

There are many programming concepts that are common to the vast majority of programming languages, but each language implements these concepts in their own unique and special way. In JavaScript, objects are used to implement many concepts. I like to think of JavaScript objects as a single language feature that wears many hats. In the previous instalment we focused on one of these hats, JavaScript’s use of objects to implement dictionaries. In this instalment we’ll look at another hat JavaScript objets get to wear — arrays. As with the previous instalment, this instalment will be a mixture of consolidated reminders of things we’ve met before, and of some new features added to arrays in more recent versions of the JavaScript language.

We’ll also look at a sample solution to the challenge set at the end of instalment 83, but unusually, we’ll do that after our look at arrays.

You can download this instalment’s ZIP file here (now via the JSDelivr CDN). If you prefer, you can access this instalment’s resources directly at the following links:

Read more

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