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In the ruby world I'm a fan of factory_bot for generating objects that will serve as test data in my unit tests. I had a bit of time to kill this evening and thought it would be fun to implement the subset of the functionality that I use in factory_bot in javascript to see how I would approach it.
This was a fun thought experiment about how I could bring some functionality from a library I like in a different language into javascript. It isn't however a 1-1 port of the functionality of factory_bot just the pieces that I found interesting to play around with in an evening. I've setup the code in a git repository if you want to have a look at it in its entirety, given time I may come back and further tune it and publish it to NPM.
Friday the 13th was a quiet evening and when the rest of the family were in bed or watching TV I chose to play around with a bit of the thought experiment. This time unlike others I wrote up what I was doing as I went along, what follows is a tidied up and expanded version of the notes that I took. While I was doing this I was primarily using two tools - RunJS for my javascript REPL playground and Typora for my notes.
This will do what we want, it will allow you to use a library like Faker to generatedata to populate your object, it may not be the fastest way to do it but I think it's pretty legible. A nice side effect of this approach is this allows our factories to use other factories to define some of their properties, like so: