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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Debugging and Error Handling | 7% | - try-catch blocks - Logging strategies and debugging techniques |
| Topic 2: Asynchronous Programming | 13% | - Promises and async/await - Event loop and asynchronous code execution - Callback patterns |
| Topic 3: Variables, Types, and Collections | 23% | - Type coercion and type conversion - JSON parsing and stringification - Array manipulation (map, filter, reduce, forEach, find) - String manipulation and Date objects - Variable declaration (var, let, const, scoping, hoisting) |
| Topic 4: Objects, Functions, and Classes | 25% | - Object creation, properties, and prototypal inheritance - ES6 Classes, constructors, methods, and inheritance - Higher-order functions and closures - Function declarations, expressions, and arrow functions - JavaScript modules (export, import) |
| Topic 5: Testing | 7% | - Automated testing strategies - Unit testing with Jest - Test-driven development principles |
| Topic 6: Browser and Events | 17% | - DOM manipulation - Event handling, propagation, bubbling, and capturing - Browser Developer Tools |
| Topic 7: Server Side JavaScript | 8% | - Node.js applications - Salesforce API integration - Modules and file operations |
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NEW QUESTION # 50
A Node.js server library uses events and callbacks. The developer wants to log any issues the server has at boot time.
Which code logs an error with an event?
Answer: B
Explanation:
console.log('ERROR', error);
}
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge Node.js event-based modules use the EventEmitter pattern.
The correct syntax for listening to events is:
emitter.on('eventName', callback)
The server library emits an 'error' event, which must be listened to using .on.
Option analysis:
A: .catch is for Promises, not EventEmitters.
B: .error is not an EventEmitter method.
C: Correct. Listens to the 'error' event.
D: try...catch only captures synchronous errors, not event-based asynchronous errors.
Therefore, the correct answer is option C.
________________________________________
JavaScript Knowledge Reference (text-only)
The EventEmitter API uses on(event, handler) to listen for events.
Errors emitted asynchronously cannot be caught with try...catch.
The 'error' event is standard for Node.js modules to signal operational errors.
NEW QUESTION # 51
Refer to HTML below:
<p> The current status of an Order: <span id ="status"> In Progress </span></p>.
Which JavaScript statement changes thetext 'In Progress' to 'Completed' ?
Answer: D
NEW QUESTION # 52
Refer to the following code:
01 class Ship {
02 constructor(size) {
03 this.size = size;
04 }
05 }
06
07 class FishingBoat extends Ship {
08 constructor(size, capacity){
09 //Missing code
10 this.capacity = capacity;
11 }
12 displayCapacity() {
13 console.log('The boat has a capacity of ${this.capacity} people.');
14 }
15 }
16
17 let myBoat = new FishingBoat('medium', 10);
18 myBoat.displayCapacity();
Which statement should be added to line 09 for the code to display
The boat has a capacity of 10 people?
Answer: A
Explanation:
FishingBoat extends Ship, so it is a subclass. In ES6 classes:
When you define a constructor in a subclass, you must call super(...) before accessing this.
super(size) calls the parent class (Ship) constructor, which sets this.size = size.
So the correct constructor is:
class FishingBoat extends Ship {
constructor(size, capacity) {
super(size); // line 09
this.capacity = capacity;
}
displayCapacity() {
console.log(`The boat has a capacity of ${this.capacity} people.`);
}
}
Why others are incorrect:
B . ship.size = size;
ship is not defined; this would cause a ReferenceError.
C . super.size = size;
super is not an instance; you must call super(...) as a function to invoke the parent constructor.
D . this.size = size;
In a subclass constructor, you must call super() before using this, otherwise you get a ReferenceError. Also this bypasses the parent constructor logic.
Relevant concepts: ES6 class inheritance, extends, super() in subclass constructors, this initialization rules.
NEW QUESTION # 53
A developer creates an object where its properties should be immutable and prevent properties from being added or modified.
Which method should be used to execute this businessrequirement ?
Answer: A
NEW QUESTION # 54
A developer is trying to handle an error within a function.
Which code segment shows the correct approach to handle an error without propagating it elsewhere?
Answer: B
NEW QUESTION # 55
......
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