Object iteration with pre-compiled iterator (v5)

Revision 5 of this benchmark created on

Preparation HTML

<script>

</script>

Setup

/**
     * Compile iterator function for a specific type.
     */
    var compileIterator = function(typeProperties) {
        // pre-compile constant iteration over object properties
        var iteratorFunStr = '(function(obj, cb) {\n';
        for (var i = 0; i < typeProperties.length; ++i) {
            iteratorFunStr += 'cb(obj.' + typeProperties[i] + ');\n';
        };
        iteratorFunStr += '})';
    
        // actually compile and return the function
        return eval(iteratorFunStr);
    };
    
    
    // now, we can build custom type descriptions of varying sizes
    var NObjectSize = 30;
    
    // create a custom test "type property set"
    var testTypeProperties = [];
    for (var i = 1; i <= NObjectSize; ++i) {
        testTypeProperties.push('a' + i);  // non-numeric properties to be on the safe side
    };
    
    
    // compile iterator function
    var iteratorFun = compileIterator(testTypeProperties);
    
    // create a test object
    var createTestObject = function() {
        var objString = '({'
        for (var i = 0; i < testTypeProperties.length; ++i) {
            objString += testTypeProperties[i] + ': ' + (i+1) + ',\n';
        }
        objString += '});';
    
        return eval(objString);
    };
    
    var o1 = createTestObject();
    var o2 = createTestObject();
    
    var aFunction = function(total, next) {
        return total * next + 1;
    };

Test runner

Ready to run.

Testing in
TestOps/sec
for ... in (sum)
var x = 0;
for (var p in o1) {
    x += o1[p];
}
ready
Pre-compiled iterator (sum)
var x = 0;
var iteratorCb = function(value) {
    x += value;
};
iteratorFun(o2, iteratorCb);
 
ready
for ... in (copy)
var x = [];
for (var p in o1) {
    x.push(o1[p]);
}
ready
Pre-compiled iterator (copy)
var x = [];
var iteratorCb = function(value) {
    x.push(value);
};
iteratorFun(o2, iteratorCb);
 
ready
for ... in (function call)
var x = 0;
for (var p in o1) {
    x += aFunction(x, o1[p]);
}
ready
Pre-compiled iterator (function call)
var x = 0;
var iteratorCb = function(value) {
    x += aFunction(x, value);
};
iteratorFun(o2, iteratorCb);
 
ready
keys + forEach
var x = 0;
Object.keys(o1).forEach(function(k)
{
  x += o1[k];
});
 
ready
keys + for
var i, x = 0;
var a1 = Object.keys(o1), s = a1.length;

for (i=0; i<s; i++)
{
  x += o1[a1[i]];
}
 
ready

Revisions

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