Fix: add note to explain number is not checked (#53155)

Co-authored-by: Jessica Wilkins <67210629+jdwilkin4@users.noreply.github.com>
Co-authored-by: Bruce Blaser <bbsmooth@gmail.com>

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/63507bcbfe4ede356e624395.md

@@ -11,7 +11,7 @@ Now that you have the value of the input, you need to split it into an array of
 
 The `.split()` method takes a string and splits it into an array of strings. You can pass it a string of characters or a RegEx to use as a separator. For example, `string.split(",")` would split the string at each comma and return an array of strings.
 
-Use a regex to split the `value` string by commas followed by any number of spaces. Store the array in an `array` variable.
+Use the `/,\s*/g` regex to split the `value` string by commas. You can tweak it based on the number of spaces seperating your values. Store the array in an `array` variable.
 
 # --hints--
 
@@ -33,6 +33,12 @@ Your `calculate` function should assign the result of the `.split()` method to t
 assert.match(code.toString(),  /array\s*=\s*value\.split()/);
 ```
 
+You should use `/,\s*/g` for the `split()` method's separator.
+
+```js
+assert.match(code.toString(), /value\.split\(\s*\/,\s*\\s*\*\s*\/g\)/);
+```
+
 # --seed--
 
 ## --seed-contents--

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/63507e4562cdde3a28e8de1b.md

@@ -17,7 +17,7 @@ array.filter(el => {
 
 The callback function needs to return a Boolean value, which indicates whether the element should be included in the new array. In this case, you want to return `true` if the element is not `NaN` (not a number).
 
-However, you cannot check for equality here, because `NaN` is not equal to itself. Instead, you can use the `Number.isNaN()` method, which returns `true` if the argument is `NaN`.
+However, you cannot check for equality here, because `NaN` is not equal to itself. Instead, you can use the `isNaN()` method, which returns `true` if the argument is `NaN`.
 
 Add a callback function to your `.filter()` method that returns `true` if the element is not `NaN`.
 
@@ -29,10 +29,10 @@ Your `.filter()` method should have a callback which accepts `el` as a parameter
 assert.match(calculate.toString(), /numbers\.filter\(\(?\s*el\s*\)?\s*=>|numbers\.filter\(function\s*\(?el\)\s*\{/)
 ```
 
-Your callback function should use `!` and `Number.isNaN()` to check if `el` is NOT `NaN`.
+Your callback function should use `!` and `isNaN()` to check if `el` is NOT `NaN`.
 
 ```js
-assert.match(calculate.toString(), /!(Number\.)?isNaN\(\s*el\s*\)/);
+assert.match(calculate.toString(), /!\s*(Number\.)?isNaN\(\s*el\s*\)/);
 ```
 
 Your callback function should return elements that are not `NaN`.