[Solved] Which of the following is the correct syntax for implementing ngOnChanges in an Angular component? — Ans: ngOnChanges(changes: SimpleChanges): void { } | Angular

Angular - Lifecycle Hooks

Which of the following is the correct syntax for implementing ngOnChanges in an Angular component?

AngOnChanges(): void { }

BngOnChanges(changes: any): string { }

CngOnChanges(changes: string[]): void { }

DngOnChanges(changes: SimpleChanges): void { }

Step-by-Step Solution

Solution:

Step 1: Recall the method signature
ngOnChanges expects a parameter of type SimpleChanges and returns void.
Step 2: Check each option's correctness
ngOnChanges(changes: SimpleChanges): void { } matches the correct signature. Others have wrong parameter types or return types.
Final Answer:
ngOnChanges(changes: SimpleChanges): void { } -> Option D
Quick Check:
Correct ngOnChanges syntax [OK]

Quick Trick: Use SimpleChanges type and void return for ngOnChanges [OK]

Common Mistakes:

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Which of the following is the correct syntax for implementing ngOnChanges in an Angular component?