A walkthrough of building a weighted random generator (loot table / gacha system) in TypeScript using Test Driven Development. The tutorial covers typing the input, implementing a RandomPicker class with pick and pickMany methods, adding input validation, and providing standalone utility functions. Jest is used for testing with a goal of 100% code coverage. The resulting library is published as an open-source npm package called wrand.

•4m read time•From playfulprogramming.com
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