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var MYAPP = MYAPP || {};
MYAPP.namespace = function (ns_string) {
    var parts = ns_string.split('.'),
        parent = MYAPP,
        i;

    // strip redundant leading global 
    if (parts[0] === "MYAPP") {
        parts = parts.slice(1);

    }
    for (i = 0; i < parts.length; i += 1) {
        // create a property if it doesn't exist
        if (typeof parent[parts[i]] === "undefined") {
            parent[parts[i]] = {};
        }

        parent = parent[parts[i]];
    }
    //console.log(parent);
    return parent;
    
};

//MYAPP.namespace('modules.module5.module51');

// assign returned value to a local var
var module2 = MYAPP.namespace('MYAPP.modules.module2'); 
console.log(module2 === MYAPP.modules.module2); // true
// skip initial `MYAPP` 
//MYAPP.namespace('modules.module51');
// long namespace
MYAPP.namespace('once.upon.a.time.there.was.this.long.nested.property');