Hello and welcome! Today, we're exploring practical data manipulation techniques in JavaScript. We'll use JavaScript arrays to represent our data stream and perform projection, filtering, and aggregation. And here's the star of the show: our operations will be neatly packaged within a JavaScript class! No mess, all clean code.
Data manipulation is akin to being a sculptor but for data. We chisel and shape our data to get the desired structure. JavaScript arrays are perfect for this, and our operations will be conveniently bundled inside a JavaScript class. So, let's get our toolbox ready! Here's a simple JavaScript class, DataStream, that will serve as our toolbox:
Our first stop is data projection. Think of it like capturing a photo of our desired features. Suppose we have data about people. If we're only interested in names and ages, we project our data to include just these details. We'll extend our DataStream class with a projectData method for this:
