JSON Object merger (v10)

Revision 10 of this benchmark created on

Preparation HTML

<script>
var Entity = function() {};

Entity.defaults = {
        id: 'ID',
        type: 'player',
        position: [0, 0],
        velocity: [0, 0],
        acceleration: [1, 1],
        thrust: 10,
        angle: Math.PI
};

Entity.merge = function(obj1, obj2) {
        var cons = obj1.constructor,
                func = cons._mergeFunc, props, p, i;

        // Create the merge function if one isn't already defined
        if(!func) {
                func = '';

                // Loop over the first objects default properties and merge obj2's values
                if((props = cons.defaults)) {
                        for(p in props) {
                                func += 'obj.'+p+' = obj2.'+p+' || obj.'+p+';'
                        }
                }

                // Create and store the new function
                func = cons._mergeFunc = new Function('obj', 'obj2', func);
        }

        // Run the merge function and return the first object
        return func(obj1, obj2), obj1;
};

Entity.mergeLoop = function(obj, obj2) {
        var props = obj.constructor.defaults;

        for(p in props) {
                obj[p] = obj2[p] || obj[p];
        }
}
</script>

Setup

var obj = new Entity();

Test runner

Ready to run.

Testing in
TestOps/sec
Dynamic-method merge
Entity.merge(obj, Entity.defaults);
ready
Iterative merge
Entity.mergeLoop(obj, Entity.defaults);
ready

Revisions

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