This example demonstrates a foundational D3.js bar chart using a hardcoded array of five values. It builds vertical bars by binding the dataset to `div` elements and setting each bar’s height dynamically with a custom scale factor. The code imports the `select` function from D3 via ES6 modules and uses `d3.select`, `.data`, `.enter`, and `.style` to create the visualization. A separate local module exports a text message, while the HTML file includes D3 v5 from UNPKG.