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Angular Change Detection Mastery Hub: The Industry Foundatio

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Q1Domain Verified
When a component's `OnPush` change detection strategy is applied, which of the following scenarios will *not* trigger a change detection cycle for that component and its descendants?
An `@Input()` property that is a primitive type (e.g., string, number) is updated with a new value.
An event handler within the component's template (e.g., `(click)`) is triggered.
An observable bound to a template property emits a new value, and the `async` pipe is use
D) A method is called directly within the component's class that modifies a property used in the template.
Q2Domain Verified
In the context of `ChangeDetectorRef`, what is the primary purpose of calling `markForCheck()` versus `detectChanges()`?
`markForCheck()` is a no-op if the component is not dirty, while `detectChanges()` always forces a check.
`markForCheck()` is used for asynchronous operations, while `detectChanges()` is for synchronous operations.
`markForCheck()` performs a deep check of all components, while `detectChanges()` only checks the current component.
`markForCheck()` schedules a change detection check for the current component and its ancestors, while `detectChanges()` immediately performs a check only for the current component and its descendants.
Q3Domain Verified
Consider a scenario with a deeply nested component tree. If `ChangeDetectionStrategy.OnPush` is applied to a parent component, and a child component's `@Input()` property is updated by a service *without* using the `async` pipe, how can the parent component be reliably notified to re-render its template which displays the child's data?
The parent component's `ngDoCheck()` lifecycle hook should manually compare the old and new values of the child's `@Input()`.
The child component should emit an `@Output()` event, and the parent should re-trigger change detection.
The parent component should use `ChangeDetectorRef.markForCheck()` within its own lifecycle hook that is aware of the service update.
The service should directly call `ChangeDetectorRef.detectChanges()` on the parent component.

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This domain protocol is rigorously covered in our 2026 Elite Framework. Every mock reflects direct alignment with the official assessment criteria to eliminate performance gaps.

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This domain protocol is rigorously covered in our 2026 Elite Framework. Every mock reflects direct alignment with the official assessment criteria to eliminate performance gaps.

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