23 lines
674 B
Markdown
23 lines
674 B
Markdown
---
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title: factoryWithSeed
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tags: array,beginner
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---
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Generates the given amount of objects based on the given factory, which receives a unique seed.
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- Creates a new array of size `amount`.
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- Fills it with some value to be able to iterate over it via `map`.
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- Uses `map`'s second argument, the index, as a seed for the factory.
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```js
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const factoryWithSeed = (amount, factory) =>
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Array(amount) // create array with so many empty slots
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.fill(0) // fill them to be able to iterate
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.map((_, i) => factory(i)) // use index as seed
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```
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```js
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const mockData = factoryWithSeed(5000, seed => ({ id: seed, name: randomAlphaNumeric(10) }));
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// 5000 items with unique IDs
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```
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