Info

a silly test of palindrome testing techniques

Preparation code

<script>
  function f1(str) {
    return str === str.split('').reverse().join('');
  }

  function f2(str) {
    var i = str.length - 1;
    var k = 0;
    while (i > k) {
      if (str.charAt(k++) !== str.charAt(i--)) return false;
    }
    return true;
  }

  function f3(str) {
    return str.substring(0, Math.floor(str.length / 2)) == (str.substring(Math.ceil(str.length / 2)).split('').reverse().join(''));
  }
</script>
<script>
  Benchmark.prototype.setup = function() {
    var str1 = "abcdefghijklmnopqrstuvwxyzzyxwvutsrqponmlkjihgfedcba";
    var str2 = "abcdefghijklmnopqrstuvwxyzyxwvutsrqponmlkjihgfedcba";
    var str3 = "abcdefghijklmnopqrstuvwxyzZyxwvutsrqponmlkjihgfedcba";
  };
</script>

Test runner

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Java applet disabled.

f1(str1) === true;
f1(str2) === true;
f1(str3) === false;

f2(str1) === true;
f2(str2) === true;
f2(str3) === false;

f3(str1) === true;
f3(str2) === true;
f3(str3) === false;

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by Kyle Simpson on 20th December 2012
• Revision 2: published by Rhys Brett-Bowen on 21st December 2012
• Revision 3: published on 16th January 2013

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