Challenge “Build Your Own Array in Javascript!”

Rules are simple:

I give you a test suite for (almost) all the functionality of the array.
You implement that functionality in the class MyArray.
You can’t use standard javascript’s Array, instead you need to use the provided wrapper PlainArray that limits what you can do:

class PlainArray<T> {
    constructor(capacity: number)
    length: number
    get(index: number): T
    set(index: number, value: T)
}

PlainArray is a fixed-size array that has one property and two methods defined: length, get(index) and set(index, value).
Even though the definition of that class is in Typescript, you will have to use vanilla ECMA Script 5.
Focus more on readability over the performance.

How to Run The Test Suite?

First, you’ll need to clone this repository:

$ git clone https://github.com/waterlink/Challenge-Build-Your-Own-Array-In-Js
$ cd Challenge-Build-Your-Own-Array-In-Js

You will need to open SpecRunner.html in your browser. You can launch it from the directory in your file explorer, or you could run it from terminal:

# Mac OS X:
$ open ./SpecRunner.html

# Most Linuxes
$ xdg-open ./SpecRunner.html

You should see something like that:

To see the test suite open ./spec/MyArraySpec.js and start making these failing tests pass one by one.

I recommend starting with the top ones, as they get harder towards the bottom.

Why?

So that you can practice your logical and problem-solving skills.

Additionally, by the end of this challenge, you’ll have much more mastery over the use of arrays in javascript.

I’m Done. Now What?

Send me a pull request to this GitHub repository. And take a look at everyone else’s solution, as well!

Just don’t peek before you are done ;)

Vishal-Isharani/Challenge-Build-Your-Own-Array-In-Js

Challenge “Build Your Own Array in Javascript!”

How to Run The Test Suite?

Why?

I’m Done. Now What?

Thank you!