Follow-up · depth 1
How would you test Built-in Control Flow @if @for @switch?
How would you test Built-in Control Flow @if @for @switch?
Answers use simple, clear English.
Audio N/AQuick interview answer
Test Built-in Control Flow @if @for @switch with unit checks for the happy path, integration tests for real I/O boundaries, and load/chaos checks so regressions show up before prod. Core idea: Pros: Clearer templates; forces track for lists. Cons: Muscle memory of structural directives.
Detailed answer
Interview answer for testing Built-in Control Flow @if @for @switch: 1) Unit: isolate the pure logic behind Built-in Control Flow @if @for @switch with deterministic fixtures. 2) Integration: exercise real timers/I/O/network boundaries the way production does. 3) Load & soak: prove the event path still meets SLOs under concurrency. 4) Failure injection: break dependencies and assert recovery/backpressure. Best practices to include: Always track by identity; prefer new syntax in Angular 17+. Call out mistakes: Using index as track for reorderable lists. Parent context: Pros: Clearer templates; forces track for lists. Cons: Muscle memory of structural directives.
Full explanation
Interviewers want a test strategy, not “I would write tests.” Tie each layer back to how Built-in Control Flow @if @for @switch fails: correctness, latency, and starvation. New template syntax replaces *ngIf/*ngFor for many cases: @if, @for (with track), @switch. Better type narrowing and performance guidance via mandatory track.
Follow-up questions
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Parent context — Built-in Control Flow @if @for @switch
Pros: Clearer templates; forces track for lists. Cons: Muscle memory of structural directives.
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