[Javascript]  Efficient and Easy to Read -- 44ms, 98%
\nvar subtractProductAndSum = function(n) {\n    const digits = Array.from(String(n), Number)\n    const sum = digits.reduce((a,b) => a+b)\n    const product = 
```\nvar subtractProductAndSum = function(n) {\n    const digits = Array.from(String(n), Number)\n    const sum = digits.reduce((a,b) => a+b)\n    const product = digits.reduce((a,b) => a*b)\n    return product-sum\n};\n```\n\n[Array.from -- MDN docs](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/from)
['JavaScript']