isNaN func vs.""+isnan

JavaScript performance comparison

Test case created

Preparation code

<script>
  x = "str";
  y = 43;
</script>

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Testing in unknown unknown
Test Ops/sec
isNaN function
if(isNaN(x));
if(isNaN(y));
pending…
"" + NaN
if(x+"" === "NaN");
if(y+"" === "NaN");
pending…

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