Remove fibonacciUntilNum

This commit is contained in:
Angelos Chalaris
2020-04-16 11:02:44 +03:00
parent 410f4443ca
commit 80fda6d3fc
2 changed files with 0 additions and 32 deletions

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@ -1,24 +0,0 @@
---
title: fibonacciUntilNum
tags: math,intermediate
---
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.prototype.reduce()` to add values into the array, using the sum of the last two values, except for the first two.
Uses a mathematical formula to calculate the length of the array required.
```js
const fibonacciUntilNum = num => {
let n = Math.ceil(Math.log(num * Math.sqrt(5) + 1 / 2) / Math.log((Math.sqrt(5) + 1) / 2));
return Array.from({ length: n }).reduce(
(acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i),
[]
);
};
```
```js
fibonacciUntilNum(10); // [ 0, 1, 1, 2, 3, 5, 8 ]
```