30-seconds-of-code/snippets/factoryWithSeed.md

title, tags

title	tags
factoryWithSeed	array,beginner

Generates the given amount of objects based on the given factory, which receives a unique seed.

• Creates a new array of size amount.
• Fills it with some value to be able to iterate over it via map.
• Uses map's second argument, the index, as a seed for the factory.

const factoryWithSeed = (amount, factory) =>
  Array(amount) // create array with so many empty slots
   .fill(0) // fill them to be able to iterate
   .map((_, i) => factory(i)) // use index as seed

const mockData = factoryWithSeed(5000, seed => ({ id: seed, name: randomAlphaNumeric(10) }));
// 5000 items with unique IDs