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docs: warn against non-memoized function calls in templates in the angular-developer skill #70168

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docs: warn against non-memoized function calls in templates in the angular-developer skill #70168

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2 changes: 2 additions & 0 deletions skills/dev-skills/angular-developer/references/components.md
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Expand Up @@ -90,6 +90,8 @@ The `@for` block iterates over collections. The `track` expression is **required

**Implicit Variables**: `$index`, `$count`, `$first`, `$last`, `$even`, `$odd`.

**Avoid calling non-memoized methods in template expressions** (e.g. `@for (x of getItems())`, `{{ formatDate(item.date) }}`). These reevaluate on every change-detection run, which is wasteful when the computation is nontrivial. Prefer a `computed()` signal, or a pure pipe, so the result is cached and only recalculated when its dependencies change. A plain function call is fine when it's a trivial/pure lookup (e.g. reading a signal, indexing an object).

### Switching Content (`@switch`)

The `@switch` block renders content based on a value. It uses strict equality (`===`) and has **no fallthrough**.
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