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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.

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.

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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