I'm almost siting all night, trying to solve this task. If you are so smart find error in my solution! Why it doesn't pass random test?
function permuteAPalindrome (input) {
let arr = input.split('');
const uniqueArr = [];

for (let i = 0; i < arr.length; i++) {
if (arr.indexOf(arr[i]) === arr.lastIndexOf(arr[i])) {
uniqueArr.push(arr[i]);
}
}
if( (uniqueArr.length < 1) || (uniqueArr.length === 1) ) return true;
else if (uniqueArr.length > 1) return false;
}

Really interesting simple task. I am so excited to complete it.

This solution maybe wrong : 4. comma "," can't be in start or end