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30-seconds-of-code/snippets/fibonacci.md
2017-12-29 22:41:43 -05:00

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### fibonacci
Generates an array, containing the Fibonacci sequence, up until the nth term.
Create an empty array of the specific length, initializing the first two values (`0` and `1`).
Use `Array.reduce()` to add values into the array, using the sum of the last two values, except for the first two.
```js
const fibonacci = n =>
Array.from({ length: n }).reduce(
(acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i),
[]
);
```
```js
fibonacci(6); // [0, 1, 1, 2, 3, 5]
```