Consider a component with an input property items which is an array. If the parent modifies the array contents but does not replace the array reference, will ngOnChanges detect the change?
hard📝 Conceptual Q9 of 15
Angular - Lifecycle Hooks
Consider a component with an input property items which is an array. If the parent modifies the array contents but does not replace the array reference, will ngOnChanges detect the change?
AYes, but only if the array length changes
BNo, because <code>ngOnChanges</code> detects changes by reference, not by internal mutations
CYes, it detects any change inside the array automatically
DNo, because arrays are not supported as inputs
Step-by-Step Solution
Solution:
Step 1: Understand how Angular detects input changes
Angular compares input references, not deep content.
Step 2: Apply to array mutation scenario
Mutating array contents without changing reference does not trigger ngOnChanges.
Final Answer:
No, because ngOnChanges detects changes by reference, not by internal mutations -> Option B
