fix: parse string before using it as argument

Author: JCPedroza

src/project-euler/008-largest-product-in-a-series/series-largest-product-naive.js

@@ -2,17 +2,19 @@ const { readFileSync } = require('fs')
 
 /**
  * Parses the number text file as a number array.
+ *
  * @param {string} numTxtPath Path to text file containing the number.
  * @returns {number[]} The number in the text file as a number array.
  */
 const numTxtToNumArr = (numTxtPath) =>
   readFileSync(numTxtPath, 'utf8')
     .split('')
-    .filter(str => !/[\s]/.test(str) && !isNaN(str))
+    .filter(str => !/[\s]/.test(str) && !isNaN(parseInt(str)))
     .map(str => parseInt(str))
 
 /**
  * Computes the product of a sub-series in a number array.
+ *
  * @param {number[]} numArr An array of numbers.
  * @param {number} index Index of the first number.
  * @param {number} scopeSize Size of the sub-series.
@@ -25,6 +27,7 @@ const getScopeProduct = (numArr, index, scopeSize) =>
 
 /**
  * Computes the largest product in a series of numbers.
+ *
  * @param {string} numTxtPath Path to text file containing the number.
  * @param {number} scopeSize Number of adjacent numbers to multiply.
  * @returns {number} Largest product in the series.