RosettaCodeData/Task/Test-a-function/Jsish/test-a-function-1.jsish

/* Palindrome detection, in Jsish */
function isPalindrome(str:string, exact:boolean=true) {
  if (!exact) {
      str = str.toLowerCase().replace(/[^a-z0-9]/g, '');
  }
  return str === str.split('').reverse().join('');
}