isNaN, typeof

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isNaN
for(var i = 0; i < 1000000; i++){
   var x = isNaN(Math.random());
}
ready
no isNaN
for(var i = 0; i < 1000000; i++){
   var x = Math.random();
}
ready
typeof
for(var i = 0; i < 1000000; i++){
    var x = typeof Math.random();
}
ready

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