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Mention Discriminated Unions #308

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Mention Discriminated Unions #308

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5244040
Mention Discriminated Unions
bennycode Mar 13, 2023
53b3447
Mention base type
bennycode Mar 13, 2023
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2 changes: 1 addition & 1 deletion Performance.md
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Expand Up @@ -180,7 +180,7 @@ For a two-element union, this is trivial and inexpensive.
However, if your union has more than a dozen elements, it can cause real problems in compilation speed.
For instance, to eliminate redundant members from a union, the elements have to be compared pairwise, which is quadratic.
This sort of check might occur when intersecting large unions, where intersecting over each union member can result in enormous types that then need to be reduced.
One way to avoid this is to use subtypes, rather than unions.
One way to avoid this is to employ a base type (`Schedule`) and [discriminate unions](https://www.typescriptlang.org/docs/handbook/typescript-in-5-minutes-func.html#discriminated-unions).

```ts
interface Schedule {
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