Default change detection strategy in Angular - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the Default change detection strategy in Angular?

It is the standard way Angular checks for changes in component data by running change detection on the entire component tree whenever an event happens.

beginner

How does Angular's Default change detection strategy detect changes?

It runs a check on all components from top to bottom to see if any data has changed and updates the view accordingly.

intermediate

When does Angular trigger the Default change detection?

Angular triggers it after events like user input, HTTP responses, timers, or any asynchronous activity.

intermediate

What is a potential downside of the Default change detection strategy?

It can be less efficient for large apps because it checks every component on each event, even if many components did not change.

beginner

How can you identify that a component uses the Default change detection strategy?

By default, Angular components use it unless you explicitly set the changeDetection property to ChangeDetectionStrategy.OnPush.

What triggers Angular's Default change detection?

A User events like clicks or typing

B Only manual calls to detectChanges()

C Only HTTP requests

D Only component initialization

Angular runs Default change detection after user events, HTTP requests, timers, and other async activities.

Which statement best describes the Default change detection strategy?

A Checks only changed components

B Checks all components on each event

C Does not check components automatically

D Runs only once at app start

Default strategy checks the entire component tree on every event.

How do you set a component to use the Default change detection strategy?

A Set changeDetection to ChangeDetectionStrategy.Default

B Set changeDetection to ChangeDetectionStrategy.OnPush

C No need to set anything, it is default

D Use a special decorator

Angular uses Default strategy automatically unless changed.

What is a common performance issue with Default change detection?

A It only works with OnPush components

B It skips checking some components

C It never updates the view

D It runs too often on all components

Default strategy runs on all components every time, which can slow large apps.

Which Angular feature can improve performance over Default change detection?

A OnPush change detection strategy

B Manual DOM manipulation

C Disabling change detection

D Using ngIf everywhere

OnPush strategy checks only when inputs change, improving efficiency.

Explain how Angular's Default change detection strategy works and when it runs.

Think about what happens after a button click or data load.

Describe one advantage and one disadvantage of using the Default change detection strategy.

Consider ease of use versus performance.