1+ // Write a JavaScript function that checks whether a passed string is palindrome or not?
2+ 3+ function check_Palindrome ( str_entry ) {
4+ // Change the string into lower case and remove all non-alphanumeric characters
5+ var cstr = str_entry . toLowerCase ( ) . replace ( / [ ^ a - z A - Z 0 - 9 ] + / g, '' ) ;
6+ var ccount = 0 ;
7+ // Check whether the string is empty or not
8+ if ( cstr === "" ) {
9+ console . log ( "Nothing found!" ) ;
10+ return false ;
11+ }
12+ // Check if the length of the string is even or odd
13+ if ( ( cstr . length ) % 2 === 0 ) {
14+ ccount = ( cstr . length ) / 2 ;
15+ } else {
16+ // If the length of the string is 1 then it becomes a palindrome
17+ if ( cstr . length === 1 ) {
18+ console . log ( "Entry is a palindrome." ) ;
19+ return true ;
20+ } else {
21+ // If the length of the string is odd ignore middle character
22+ ccount = ( cstr . length - 1 ) / 2 ;
23+ }
24+ }
25+ // Loop through to check the first character to the last character and then move next
26+ for ( var x = 0 ; x < ccount ; x ++ ) {
27+ // Compare characters and drop them if they do not match
28+ if ( cstr [ x ] != cstr . slice ( - 1 - x ) [ 0 ] ) {
29+ console . log ( "Entry is not a palindrome." ) ;
30+ return false ;
31+ }
32+ }
33+ console . log ( "The entry is a palindrome." ) ;
34+ return true ;
35+ }
36+ check_Palindrome ( 'madam' ) ;
37+ check_Palindrome ( 'nurses run' ) ;
38+ check_Palindrome ( 'fox' ) ;
39+
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