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add: solution to project euler problem 20 (#38257)

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* add: solution to project euler problem 20

* Update curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-20-factorial-digit-sum.english.md

Accidentally added last line. Calling function is unnecessary in solution.

Co-Authored-By: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

* right place for starting braces

Co-Authored-By: Manish Giri <manish.giri.me@gmail.com>

* moved starting brace to previous line.

Co-Authored-By: Manish Giri <manish.giri.me@gmail.com>

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>
Co-authored-by: Manish Giri <manish.giri.me@gmail.com>
This commit is contained in:
Sanket Kogekar
2020-02-26 11:22:40 -08:00
committed by GitHub
parent 2c3de17c74
commit 1a87f1f7c0
1 changed files with 8 additions and 1 deletions
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curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-20-factorial-digit-sum.english.md
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@ -61,7 +61,14 @@ sumFactorialDigits(100);
<section id='solution'>
```js
// solution required
let factorial = (n) => n <= 1 ? BigInt(n) : BigInt(n) * BigInt(factorial(--n));
let sumDigits = n => n.toString().split('').map(x => parseInt(x)).reduce((a,b) => a + b);
function sumFactorialDigits(n) {
return sumDigits(factorial(n));
}
```
</section>