When you speak or write in a human language, you typically string together nouns and verbs to create action. You might then spice things up with adjectives, adverbs, pronouns, conjunctions, prepositions, and interjections. However, the real work of a sentence is done by the nouns and verbs.
When we say that an expression “resolves to a value,” what we mean is that when everything the computer needs to do is done, some sort of value is produced. For example,
In this chapter, we show you how to create and ...