1. A processor implemented method to manage a global feature library usable with a continuous delivery environment, the method comprising: providing the global feature library with a plurality of features defined therein, the global feature library including feature switches for respective features of the plurality of features, each feature switch useable with an application code, the global feature library further including a global value rule; linking the feature switches to the application code, each feature switch of the feature switches including a feature value associated therewith, the feature value of a first feature switch of the feature switches to turn on and off a first feature associated with the first feature switch based on the global value rule; in response to a request to change the global value rule, transmitting, by a server, an update of the feature value of the first feature switch to a plurality of client devices that store the feature value of the first feature switch in respective memories of the plurality of client devices, the update to cause a change of the feature value of the first feature switch stored in the respective memories of the plurality of client devices; and transmitting the global value rule to the plurality of client devices that store respective local feature libraries, each local feature library including the global value rule and a subset of the plurality of features.