This example presents five JavaScript practice problems for working with arrays and objects, with instructions to view results in the developer console rather than through SVG output. It demonstrates array iteration, object property matching, filtering common elements, sorting objects by population using a comparator function, and applying the modulus operator within a loop to identify non-multiples of three. The code uses d3.range to generate an array of integers and d3.min to find the minimum state name, alongside standard JavaScript array methods like forEach, includes, and sort.