31. What are providers in Angular?
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Angular Interview Questions
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32. What is hierarchical dependency injection?
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33. What is the difference between constructor injection and inject()?
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34. What are services in Angular?
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35. How do singleton services work?
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36. What is providedIn:'root'?
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37. What are Angular lifecycle hooks?
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38. What is ngOnInit used for?
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39. What is the difference between constructor and ngOnInit?
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40. What is ngOnDestroy and why is it important?
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