Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var testObject = {theNumber: 42};
    
    var objectId = 1000000;
    
    getHash1 = function(value) {
        if (typeof value === 'number' || typeof value === 'boolean') {
            return value;
        } else if (typeof value === 'string') {
            return '"' + value + '"';
        } else if (value === undefined) {
            return 'undefined';
        } else if (value === null) {
            return 'null';
        } else {
            value._hash = value._hash || ('[object ' + (objectId++) + ']');
            return value._hash;
        }
    }
    
    function getHash2(value) {
        if (typeof value === 'object') {
            if (value === null)
                return 'null';
            value._hash = value._hash || ('[object ' + (objectId++) + ']');
            return value._hash;
        }
        if (typeof value === 'string')
            return "'" + value;
        return '' + value;
    }
  };
</script>

Test runner

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getHash1()
getHash1(null)
getHash1(true)
getHash1(false)
getHash1(42)
getHash1('42')
 

getHash2()
getHash2(null)
getHash2(true)
getHash2(false)
getHash2(42)
getHash2('42')
 

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