Preparation code

<script>var testArray=[],testSearch=[];
for(var i = 0;i<10000;i++){
  testArray.push(Math.ceil(Math.random()*10000));
}

for(var i = 0;i<1000;i++){
  testSearch.push(testArray[Math.floor(Math.random()*10000)]);
}
</script>

Test runner

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var c = 0;
for(var l=testSearch.length;--l;){
  if( testArray.indexOf(testSearch[l]) > -1 ){
   c++;
  }
}
 

var c = 0;
for(var l=testSearch.length;--l;){
  if( ~testArray.indexOf(testSearch[l]) ){
   c++;
  }
}
 

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