Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var isIntOR = function( n ) {
    n===+n && n===(n|0);
    };
    
    var isIntP = function( n ) {
    n===Number(n) && n===parseInt(n);
    };
    
    var isFloatOR = function( n ) {
    n===+n && n!==(n|0);
    };
    
    var isFloatP = function( n ) {
    n===Number(n) && n!==parseInt(n);
    };
    
    var isIntM = function(n) {
       return ((typeof n==='number')&&(n%1===0));
    }
    
    var isFloatM = function(n) {
       return ((typeof n==='number')&&(n%1!==0));
    }
  };
</script>

Test runner

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Java applet disabled.

var n = Math.random() * 1000;
isIntOR( n );

var n = Math.random() * 1000;
isIntP( n );

var n = Math.random() * 1000;
isFloatOR( n );

var n = Math.random() * 1000;
isFloatP( n );

var n = Math.random() * 1000;
isIntM( n );

var n = Math.random() * 1000;
isFloatM( n );

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