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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Variables, Types, and Collections | 23% | - Type coercion and conversion - JSON parsing and manipulation - Arrays and collections - Truthy and falsy evaluations - Strings, numbers, and dates - Variable declarations and initialization - Primitive and complex data types |
| Topic 2: Server Side JavaScript | 8% | - Package management (npm) - Node.js fundamentals - Core Node.js modules - Server-side JavaScript implementations - CLI commands |
| Topic 3: Browser and Events | 17% | - Event handling and listeners - Browser-specific APIs - Event propagation (bubbling and capturing) - Browser Developer Tools usage - DOM manipulation - Interacting with forms and user input |
| Topic 4: Testing | 7% | - Test coverage and reliability - Unit testing concepts - Writing and modifying unit tests - Test effectiveness evaluation |
| Topic 5: Objects, Functions, and Classes | 25% | - Execution flow and context - Modules and decorators - Variable scope and closures - Object creation and manipulation - Arrow functions - Prototypal inheritance - Higher-order functions - Function declarations and expressions - ES6 classes and inheritance |
| Topic 6: Debugging and Error Handling | 7% | - Custom error types - Breakpoints and code inspection - Console methods for debugging - Error handling techniques (try/catch/finally) |
| Topic 7: Asynchronous Programming | 13% | - Callbacks - Asynchronous patterns for business requirements - Promises (creation, chaining, error handling) - Event loop and execution flow - Async/Await syntax |
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NEW QUESTION # 21
A developer is working on an ecommerce website where the delivery date is dynamically
calculated based on the current day. The code line below is responsible for this calculation.
Const deliveryDate = new Date ();
Due to changes in the business requirements, the delivery date must now be today's
date + 9 days.
Which code meets this new requirement?
Answer: D
NEW QUESTION # 22
Refer to following code:
class Vehicle {
constructor(plate) {
This.plate =plate;
}
}
Class Truck extends Vehicle {
constructor(plate, weight) {
//Missing code
This.weight = weight;
}
displayWeight() {
console.log('The truck ${this.plate} has a weight of ${this.weight} lb.');}}
Let myTruck = new Truck('123AB', 5000);
myTruck.displayWeight();
Which statement should be added to line 09 for the code to display 'The truck 123AB has a
weight of 5000lb.'?
Answer: A
NEW QUESTION # 23
Refer to the code below:
01 let car1 = new promise((_, reject) =>
02 setTimeout(reject, 2000, "Car 1 crashed in"));
03 let car2 = new Promise(resolve => setTimeout(resolve, 1500, "Car 2
completed"));
04 let car3 = new Promise(resolve => setTimeout (resolve, 3000, "Car 3
Completed"));
05 Promise.race([car1, car2, car3])
06 .then(value => (
07 let result = $(value) the race. `;
08 ))
09 .catch( arr => (
10 console.log("Race is cancelled.", err);
11 ));
What is the value of result when Promise.race executes?
Answer: B
NEW QUESTION # 24
A developer wants to use a module named universalContainerLib and then call functions from it.
How should a developer import every function from the module and then call the functions foo and bar?
Answer: B
NEW QUESTION # 25
A page loads 50+ < div class= " ad-library-item " > elements, all ads.
Developer wants to quickly and temporarily remove them.
Options:
Answer: B
Explanation:
The goal:
" Temporarily and quickly remove them. "
The fastest way is to run a script in the browser console that removes all such elements:
document.querySelectorAll( ' .ad-library-item ' ).forEach(el = > el.remove()); This immediately removes all 50+ elements and requires no page reload.
Option analysis:
* A & B : Preventing load events is unreliable and does not remove already-created DOM nodes.
* C : Correct-console code can remove all matching DOM elements instantly.
* D : Possible but extremely slow; removing 50+ elements one by one in the inspector is not "quick." Therefore, C is the best answer.
JavaScript Knowledge References (text-only)
* The browser console can run arbitrary JavaScript that manipulates the DOM.
* document.querySelectorAll() returns all matching DOM nodes.
* Nodes can be removed using .remove().
NEW QUESTION # 26
......
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