The query_one() method throughout the Textual documentation allows users to retrieve a single widget that matches a CSS selector or a widget type. You can pass in up to two parameters to query_one(), which are the CSS selector and the widget type, or both at the same time.
The project behind this post is intentionally a bit over-engineered - in the "let's see what breaks when things grow" sense. That's by design. While a simple recipe example could easily be modelled with plain strings and numbers, cookbook explores more advanced, real-world concerns: extensibility, customisation, validation, and precise handling of numeric values, including floating-point quantities. The recipe domain is just a familiar, low-stakes vehicle for discussing these deeper ideas.
The toString() method is very simple. You can call it on anything, and if nothing has been defined, it'll use the default version. Many objects, like arrays, do define their own version. Custom objects can also define a version. When you interpolate an object into a string literal- console.log("This is my object: " + myObject)-it will call the toString() method.
