[Solved] You have a parent component passing an object as input to a child component using OnPush strategy.... Will the child detect the change and update its view? | Angular

Angular - Performance Optimization

You have a parent component passing an object as input to a child component using OnPush strategy. The parent updates a property inside the object without changing the object reference. Will the child detect the change and update its view?

ANo, because OnPush only detects changes when the input reference changes.

BYes, but only if you call <code>markForCheck()</code> manually.

CYes, because OnPush detects deep changes inside objects automatically.

DNo, because OnPush disables all change detection for objects.

Step-by-Step Solution

Solution:

Step 1: Understand OnPush input change detection
OnPush detects changes by checking if the input reference changes, not deep object mutations.
Step 2: Analyze object mutation effect
Changing a property inside the object without changing the reference does not trigger OnPush detection.
Step 3: Evaluate other options
Yes, because OnPush detects deep changes inside objects automatically. is false because OnPush does not do deep checks. Yes, but only if you call markForCheck() manually. is partially true but not automatic. No, because OnPush disables all change detection for objects. is incorrect; OnPush does not disable detection for objects.
Final Answer:
No, because OnPush only detects changes when the input reference changes. -> Option A
Quick Check:
OnPush detects input reference changes only = C [OK]

Quick Trick: OnPush tracks input references, not deep object changes [OK]

Common Mistakes:

Assuming deep object changes trigger OnPush
Thinking OnPush disables detection for objects
Forgetting to update object reference to trigger detection

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More Angular Quizzes

Will the child detect the change and update its view?

Step 1: Understand OnPush input change detection

Step 2: Analyze object mutation effect

Step 3: Evaluate other options

Final Answer:

Quick Check:

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