Naming of TypeScript s union and intersection types

Question

The logic behind the words union types and intersection types in TypeScript is beyond me.

If the properties of distinct types are sets of properties, the final type will be the union of those sets if I combine them with the & operator. Following that rationale, I believe types like these should be referred to as union types. I can only use the common properties of them when I join them with |, which is the intersection of the sets.

Answer 1

The type A | B refers to objects which are either A or B. In other words, values of such type are drawn from the union of values for A and values for B.

The type A & B refers to objects which are both A and B. In other words, values of such type are drawn from the intersection of values for A and values for B.

The naming and semantics are identical in other languages such as C++.

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