Sample implementation of palindrome checking function in JavaScript

isPalindrome.js

function isPalindrome( string ) {
  var notWordPattern = /\W/g,
    alphaNumericOnly = string
		  .replace( notWordPattern, "" )
		  .toLowerCase(),
    alphaNumericOnlyReversed = alphaNumericOnly.reverse()

  return alphaNumericOnly == alphaNumericOnlyReversed
}