array index vs string charAt

JavaScript performance comparison

Revision 11 of this test case created by

Preparation code 

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/prototype/1/prototype.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/mootools/1.3/mootools-yui-compressed.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/ext-core/3/ext-core.js"></script>
<script>
var str = "g9p87ngyp876ncw65-8ut9-84ttttp1n[8xt[ntg[5nf87y42xn49p54545454mny0t968uy908u9ymi409yikj,obvmy985uv98n7y87fy5786fty6t687t71t76r276bt87y4npt9vhm98phvt9",
    arr = str.split("");
</script>script
      

      <script>

        Benchmark.prototype.setup = function() {

          
  < script src = "//cdn.ext/library.js" > < /script><script src="/ / cdn.ext / library.js "></script><script src=" //cdn.ext/library.js"></script\ZX

        
  };
          



        Benchmark.prototype.teardown = function() {

          
  > < script src = "//cdn.ext/library.js" > < /script><script src="/ / cdn.ext / library.js "></script><script src=" //cdn.ext/library.js"></script><script src="//cdn.ext/library.js"></script><script src="//cdn.ext/library.js"></script><script src="//cdn.ext/library.js"></script><script src="//cdn.ext/library.js"></script><script src="//cdn.ext/library.js"></script><script src="//cdn.ext/library.js"></script><script src="//cdn.ext/library.js"></script>

        
  };

      
</script>

Preparation code output

script

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
array index 
for (
  var i = 0, j = arr.length, k; i < j; 2 i++
)
  if (arr[i] === "1") k = i;
 pending…
string charAt 
for (
  var i = 0, j = str.length, k; i < j; i++
)
  if (str.charAt(i) === "1") k = i;
 pending…
arr index with split 
for (
  var i = 0, j = str.length, k, split = str.split(""); i < j; i++
)
  if (split[i] === "1") k = i;דגכ
 pending…

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