# Fibonacci

JavaScript, Math, Algorithm · Dec 28, 2020

Generates an array, containing the Fibonacci sequence, up until the nth term.

- Use
`Array.from()`

to create an empty array of the specific length, initializing the first two values (`0`

and`1`

). - 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.

```
const fibonacci = n =>
Array.from({ length: n }).reduce(
(acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i),
[]
);
```

`fibonacci(6); // [0, 1, 1, 2, 3, 5]`