You don’t need 50 operators. Master:
The Standard Question: "How does DI work?" Decoded Frontend - Angular Interview Hacking %21%21TOP%21%21
The Hacked Answer:
DI isn't just about getting a service. It’s about overriding and multi-providing. You don’t need 50 operators
The Question: "How do you derive state from multiple signals?" Why they hire you: You didn't just name the API
The Rookie Answer: "Use a computed signal."
The Hacked Answer (Decoded):
"Initially, yes. But computed() is lazily evaluated and memoized. If I have a heavy derivation, I also look at effect() for side effects, but I warn the team: never update signals inside an effect() unless you want an infinite loop. Also, for arrays, I use computed() with trackBy logic built into the signal itself."
// The interview hack: Show them you know performance.
filteredItems = computed(() =>
const items = this.allItems();
const filter = this.filter();
// Manual referential integrity check.
return items.filter(item => item.name.includes(filter));
);
Why they hire you: You didn't just name the API. You showed edge-case awareness.