[Solved] What does the OnPush change detection strategy do in Angular? — Ans: It checks for changes only when input properties change or events occur. | Angular

Angular - Performance Optimization

What does the OnPush change detection strategy do in Angular?

AIt disables change detection completely.

BIt checks for changes only when input properties change or events occur.

CIt forces Angular to check for changes on every event regardless of inputs.

DIt updates the component only when manually triggered by the developer.

Step-by-Step Solution

Solution:

Step 1: Understand OnPush behavior
OnPush strategy tells Angular to run change detection only when input properties change or events happen inside the component.
Step 2: Compare with other options
Options A, C, and D describe behaviors that are not how OnPush works. It does not disable detection, nor does it check on every event or require manual triggers.
Final Answer:
It checks for changes only when input properties change or events occur. -> Option B
Quick Check:
OnPush triggers on input or event changes = B [OK]

Quick Trick: OnPush triggers only on input or event changes [OK]

Common Mistakes:

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What does the OnPush change detection strategy do in Angular?