Working on local math JavaScript for a build prep page for build and hold recipes. The math takes a number of stored values and then allows the user to work with those stored numbers to get the quantities and costs of the recipe/build. Most of my work today was on the output side of the equation. Recipes have ingredients (what goes in) and outputs (what comes out). Lots of testing, formatting, and making notes about what is going on. Sometimes it gets pretty deep.