gistfile1.js

/*
 * NodeJS Test Case for the blog post:
 * "What's faster: JSON.parse+stringify or extend/mixin?"
 * http://dracoblue.net/dev/whats-faster-jsonparsestringify-or-extendmixin/166/
 */

extend = process.mixin;
extend(true, {}, {})

var sys = require("sys");

var test_object = {};

var benchmark = function(function_name, function_object) {
    var before_timestamp = new Date().getTime();
    function_object();
    var after_timestamp = new Date().getTime();
    sys.puts("  " + Math.floor((after_timestamp - before_timestamp)) + 'ms ' + function_name);
}

var a_key = "", b_key = "", c_key = "", d_key = "";

for (var i=0; i < 1; i++) {
    a_key = "a" + Math.floor(i / 100000);
    b_key = "b" + Math.floor(i / 10000);
    c_key = "c" + Math.floor(i / 1000);
    d_key = "d" + Math.floor(i / 100);
    test_object[a_key] = test_object[a_key] || {};
    test_object[a_key][b_key] = test_object[a_key][b_key] || {};
    test_object[a_key][b_key][c_key] = test_object[a_key][b_key][c_key] || {};
    test_object[a_key][b_key][c_key][d_key] = test_object[a_key][b_key][c_key][d_key] || {};
    test_object[a_key][b_key][c_key][d_key]["e" + i] = i + "v";
}

sys.puts("JSON-String: " + JSON.stringify(test_object).length + " characters");

benchmark("3000x JSON.parse(JSON.stringify(object))", function() {
    for (var k=0; k<3000;k++) {
        JSON.parse(JSON.stringify(test_object));
    }
});

benchmark("3000x extend(true, {}, object)", function() {
    for (var k=0; k<3000;k++) {
        extend(true, {}, test_object);
    }
});