Finished

Test Name	Status
single zero with space is invalid	Fail
single digit strings can not be valid	Pass
a single zero is invalid	Pass
a simple valid SIN that remains valid if reversed	Pass
a simple valid SIN that becomes invalid if reversed	Pass
a valid Canadian SIN	Pass
invalid Canadian SIN	Pass
invalid credit card	Pass
invalid long number with an even remainder	Pass
invalid long number with a remainder divisible by 5	Pass
valid number with an even number of digits	Pass
valid number with an odd number of spaces	Pass
valid strings with a non-digit added at the end invalid	Pass
valid strings with punctuation included become invalid	Pass
valid strings with symbols included become invalid	Pass
more than a single zero is valid	Pass
input digit 9 is correctly converted to output digit 9	Pass
very long input is valid	Pass
valid luhn with an odd number of digits and non zero first digit	Pass
using ascii value for non-doubled non-digit isn't allowed	Pass
using ascii value for doubled non-digit isn't allowed	Pass
non-numeric, non-space char in the middle with a sum that's divisible by 10 isn't allowed	Pass

+{
 //
 // This is only a SKELETON file for the 'Luhn' exercise. It's been provided as a
 // convenience to get you started writing code faster.
  * @param {string} number
  * @returns {boolean}
  */
+export const valid = (number) => {
+  throw new Error('Remove this line and implement the function');
+const valid = (number) => {
+  // Edge Case: Strings of length 1 or less are not valid
+  if (number.length <= 1) {
+    return false;
+  }
+  // Remove all spaces from the string
+  const cleanedNumber = number.replace(/\s/g, '');
+  // Edge Case: Strings with only spaces (after cleaning become empty)
+  if (cleanedNumber.length === 0) {
+    return false;
+  }
+  // Edge Case: Strings with non-digit characters are disallowed
+  if (!/^\d+$/.test(cleanedNumber)) {
+    return false;
+  }
+  let sum = 0;
+  const length = cleanedNumber.length;
+  // Process digits from right to left
+  for (let i = length - 1; i >= 0; i--) {
+    let digit = parseInt(cleanedNumber[i], 10);
+    // Double every second digit starting from the right
+    if ((length - 1 - i) % 2 === 1) {
+      digit *= 2;
+      // If doubling results in a number > 9, subtract 9
+      if (digit > 9) {
+        digit -= 9;
+      }
+    }
+    sum += digit;
+  }
+  // The number is valid if the sum is divisible by 10
+  return sum % 10 === 0;
 };
+// Handled Edge Cases: Strings of length 1 or less, strings with only spaces, strings with non-digit characters
+module.exports = { valid };
+}

Polyglot JavaScript - without test patch