TYPESCRIPT-BASICS5 MIN READ
Walk a generic helper
Identify when a generic type parameter preserves useful input-output relationships.
decision trail relationship map common-trap callout The helper firstItem should work for several arrays without losing the item type. Returning any makes every caller less safe. Generics Preserve relationships A type parameter is worth adding when the caller's type flows through the helper. any[] → any Reusable but unsafe The caller keeps their item type. Generic means relationship, not vague reuse. 01 Relationship 02 Return 03
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