Update and rename fibsTillNum.md to fibonacciCountUntilNum.md

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Angelos Chalaris
2017-12-23 12:13:21 +02:00
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parent 052407cbeb
commit 99b5fce9c7
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### fibonacciCountUntilNum
Returns the number of fibonnacci numbers up to `num`(`0` and `num` inclusive).
Use a mathematical formula to calculate the number of fibonacci numbers until `num`.
```js
const fibonacciCountUntilNum = num =>
Math.ceil(Math.log(num * Math.sqrt(5) + 1/2) / Math.log((Math.sqrt(5)+1)/2));
// fibonacciCountUntilNum(10) -> 7
```

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### fibsTillNum
Returns the number of fibonnacci numbers till num(0 and num inclusive).
```js
const fibsTillNum = num =>
Math.ceil(Math.log(num * Math.sqrt(5) + 1/2) / Math.log((Math.sqrt(5)+1)/2))
// fibonacci(5) -> [0,1,1,2,3]
// fibsTillNum(10) -> 7
```