Angular and RxJS Online Test
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The Angular and RxJS online test evaluates a candidate’s knowledge of the Angular front-end web framework and reactive programming with RxJS.
It is an ideal test for pre-employment screening. A good Angular developer should have an in-depth understanding of Angular components and should be able to use that knowledge to create robust, scalable, and user-friendly web applications, as well as use RxJS to implement asynchronous and event-driven features.
The online test requires candidates to answer multiple choice, fill-in-the-blank, and coding questions about Angular and RxJS.
Sample public questions
Finish the ShoppingList component. The component will receive an array of strings as the items array. It should render one li element per item in the array.
For example, if the items array is ["Bread", "Eggs", "Milk"], the rendered HTML should look like:
<ul>
<li>Bread</li>
<li>Eggs</li>
<li>Milk</li>
</ul>
The code for running the example case locally is provided here.
Consider the following RxJS code for testing how a given damage Subject affects the health of a Player object in a game:
class Player {
name: string;
health: number;
damageSubscription: Subscription;
constructor(name, damageSubject) {
this.name = name;
this.health = 100;
this.damageSubscription = damageSubject.subscribe((damage) => {
this.health -= damage;
console.log(this.name + " was hurt for " + damage + " damage");
});
}
takeCover() {
this.damageSubscription.unsubscribe();
interval(1000)
.pipe(
takeWhile(() => this.health < 100),
map(() => 10),
tap(() => console.log(this.name + " is healing, current health is " + this.health))
)
.subscribe((heal) => {
this.health += heal;
});
}
}
const explosion = new Subject();
const john = new Player("John", explosion);
const sam = new Player("Sam", explosion);
explosion.next(10);
john.takeCover();
explosion.next(20);
const paul = new Player("Paul", explosion);
sam.takeCover();
explosion.next(20);
paul.takeCover();
What options will be true after the above code is run?
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22 more premium Angular and RxJS questions
Cats and Dogs, Movie Details, Awesome Tracking, Fresh Food, Structural Directive, Cards Widget, Dark Mode, Optional Ingredient, Upgrades, Observing Username, User Form, Count Binding, Decimal Pipe, Single Input, Currency Format, Report Summary, Toggle Border, Delivery Details, Weather Form, Log Post Data, Clothes, Dictionary Definition.
Skills and topics tested
- Angular
- Components
- Services
- HTTP Routing
- RxJS
- Bug Fixing
- Pipeable Operator
- RxJS Observable
- RxJS Subject
- Structural Directive
- Directives
- Event Binding
- Event Handling
- One-Way Binding
- Forms
- Two-Way Binding
- Expressions
- Angular Pipes
- Data Binding
- Creation Operator
For job roles
- Angular Developer
- RxJS Developer
Sample candidate report
What others say
Simple, straight-forward technical testing
TestDome is simple, provides a reasonable (though not extensive) battery of tests to choose from, and doesn't take the candidate an inordinate amount of time. It also simulates working pressure with the time limits.
Jan Opperman, Grindrod Bank
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