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Why is it important to avoid heavy processing inside ngDoCheck in Angular?

hard📝 Conceptual Q10 of 15
Angular - Lifecycle Hooks
Why is it important to avoid heavy processing inside ngDoCheck in Angular?
ABecause ngDoCheck only runs once, heavy processing is wasted
BBecause ngDoCheck runs frequently during every change detection cycle, heavy processing slows the app
CBecause ngDoCheck cannot access component properties
DBecause ngDoCheck is deprecated and should not be used
Step-by-Step Solution
Solution:

  1. Step 1: Understand ngDoCheck frequency

    ngDoCheck is called every change detection cycle, which can be many times per second.

  2. Step 2: Impact of heavy processing

    Heavy or slow code inside ngDoCheck causes UI lag and poor app performance.

  3. Final Answer:

    Because ngDoCheck runs frequently during every change detection cycle, heavy processing slows the app -> Option B

  4. Quick Check:

    Frequent ngDoCheck calls require lightweight code [OK]
Quick Trick: Keep ngDoCheck code fast to avoid UI lag [OK]
Common Mistakes:
  • Thinking ngDoCheck runs once
  • Believing ngDoCheck cannot access properties
  • Assuming ngDoCheck is deprecated

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