Declare arrays using `T[]` or `Array<T>`.
Section: Primitive Types and Annotations
Type arrays
typescript
typescript
const ids: number[] = [1, 2, 3];
const names: Array<string> = ["Ada", "Linus"];Explanation
Both array syntaxes are common; choose one style and stay consistent.
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Same sheet · prioritizing Primitive Types and Annotations
Annotate basic variables
Explicitly type strings, numbers, and booleans.
Annotate object shapes
Describe the expected properties of an object.
Restrict values with literal unions
Use exact string values for safer APIs.
Freeze literals with `as const`
Preserve readonly literal values for objects and arrays.