isnan parsefloat vs typeof-number

Benchmark created on

Preparation HTML

<script>
  var a = Math.random()*10;
  var b = a;
</script>

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Testing in
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isNan
var c = !isNaN( parseFloat( a ) ) && isFinite(a);
ready
typeof number
var d = (typeof( b ) === "number") && isFinite(b);
ready

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