State
State is a crucial component to how software works. The concept of state in software is much like state in any other context. If you were to ask me what state I am in, I might answer with the JSON in Listing 2.4.
Listing 2.4 My Current State in JSON Form
{ "isSitting": true, "consciousness": "drowsy", "mood": "restless", "heartRate": 73}
After reviewing my state, you might decide that I should take a walk. Similarly, software can use state to determine how it should behave. For example, Gmail has a set of keyboard shortcuts to help users manage their emails more efficiently. One of the most commonly used shortcuts (for me, at least) is typing g and then i to go to the inbox. If I am in the middle of typing an email and I type “give me ...
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