24 lines
691 B
Markdown
24 lines
691 B
Markdown
---
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title: fibonacci
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tags: math,algorithm,intermediate
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firstSeen: 2017-12-17T16:41:31+02:00
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lastUpdated: 2020-12-28T13:49:24+02:00
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---
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Generates an array, containing the Fibonacci sequence, up until the nth term.
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- Use `Array.from()` to create an empty array of the specific length, initializing the first two values (`0` and `1`).
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- Use `Array.prototype.reduce()` and `Array.prototype.concat()` to add values into the array, using the sum of the last two values, except for the first two.
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```js
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const fibonacci = n =>
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Array.from({ length: n }).reduce(
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(acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i),
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[]
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);
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```
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```js
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fibonacci(6); // [0, 1, 1, 2, 3, 5]
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```
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