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An alternative and possibly simpler approach to getting set up and using Aurelia. The previous approach can be found at the following link https://www.technical-recipes.com/2019/getting-started-with-aurelia-js/ Prerequisites The Aurelia CLI has a pre-requisite, Node.js . Get it from here: https://nodejs.dev/download/ In Visual Studio Code press Ctrl + P and type the following command: [code lang="xml"] ext install aurelia [/code] Still in Visual Studio Code, install the Aurelia CLI via the following command: [code lang="xml"] npm install aurelia-cli -g [/code] Step 1: Create a project folder In Windows Explorer create a directory for your Aurelia code projects if you have not yet done so: Step 2: Create the Aurelia project Open Visual Studio Code and in the terminal window enter the 'au new' command plus the name of your Aurelia project: [code lang="xml"] au new projectName [/code] When prompted, select if you want y...

Useful links: https://code.tutsplus.com/tutorials/how-to-use-map-filter-reduce-in-javascript--cms-26209 https://medium.com/poka-techblog/simplify-your-javascript-use-map-reduce-and-filter-bd02c593cc2d To summarize: map Creates a new array by transforming every element in an array, individually. filter Creates a new array by removing elements that don't belong. reduce Takes all of the elements in an array, and reduces them into a single value. reduce method executes a provided function for each value of the array (from left-to-right). reduce passes your callback four arguments: The current value The previous value The current index The array you called reduce on In this post I use playcode.io to do the compiling of the JavaScripts online. Example Suppose we have the following array of objects, and we wish to filter the list of objects whose age is greater than 12, put the ages of those filtered objects into another array, and find the total age f...