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//     Underscore.js Sample Code

(function() {

// Baseline setup
    // --------------

// Establish the root object, `window` in the browser, or `exports` on the server.
    var root = this;

// Save the previous value of the `_` variable.
    var previousUnderscore = root._;

// Save bytes in the minified (but not gzipped) version:
    var ArrayProto = Array.prototype, ObjProto = Object.prototype, FuncProto = Function.prototype;

// Create quick reference variables for speed access to core prototypes.
    var
        push             = ArrayProto.push,
        slice            = ArrayProto.slice,
        toString         = ObjProto.toString,
        hasOwnProperty   = ObjProto.hasOwnProperty;

// All **ECMAScript 5** native function implementations that we hope to use
    // are declared here.
    var
        nativeIsArray      = Array.isArray,
        nativeKeys         = Object.keys,
        nativeBind         = FuncProto.bind,
        nativeCreate       = Object.create;

// Reusable constructor function for prototype setting.
    var Ctor = function(){};

// Create a safe reference to the Underscore object for use below.
    var _ = function(obj) {
        if (obj instanceof _) return obj;
        if (!(this instanceof _)) return new _(obj);
        this._wrapped = obj;
    };

// Export the Underscore object for **Node.js**, with
    // backwards-compatibility for the old `require()` API. If we're in
    // the browser, add `_` as a global object.
    if (typeof exports !== 'undefined') {
        if (typeof module !== 'undefined' && module.exports) {
            exports = module.exports = _;
        }
    }
)();