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The most commonly used JavaScript effect on the Web is the image rollover. For the one person with access to the Web who’s never seen one before, an image rollover happens when you move your ...

Let’s start by looking at the code, which you can see in action by clicking here: Most of this code should look familiar if you read the previous JavaScript lesson about making a single rollover.

Use popular 'grammar of data' syntax to filter and subset your two-dimensional JavaScript arrays and more. Here's how to use Arquero for data wrangling in Observable JavaScript and Node.js.