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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Asynchronous Programming | 13% | - Fetch API and HTTP requests - Callbacks and callback hell - Event loop and micro/macro tasks - Promises and chaining - Async/await syntax |
| Topic 2: Objects, Functions, and Classes | 25% | - Decorators and advanced function patterns - Class syntax, inheritance, and prototypes - Closures and execution context - Object creation, properties, and methods - Modules and imports/exports - Function definitions, parameters, and scope |
| Topic 3: Browsers and Events | 17% | - Window and document object properties - Document Object Model (DOM) manipulation - Event handling, propagation, and delegation - Browser APIs and Web Storage - Script loading and execution order |
| Topic 4: Testing | 7% | - Test doubles and mocks - Code coverage and best practices - Testing frameworks and assertions - Unit testing concepts |
| Topic 5: Variables, Types, and Collections | 23% | - Type coercion and conversion rules - Variable declaration and initialization - Array methods and data manipulation - Truthy and falsy values - JSON parsing and usage - Working with strings, numbers, dates, and booleans |
| Topic 6: Server-Side JavaScript | 8% | - Module system and require/import - Core Node.js modules - Command-line tools and scripts - Node.js fundamentals and runtime |
| Topic 7: Debugging and Error Handling | 7% | - Debugging tools and breakpoints - Defensive programming practices - Console methods and logging - Error types and exception handling |
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NEW QUESTION # 25
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: A
NEW QUESTION # 26
There is a new requirement for a developer to implement a currPrice method that will return the current price of the item or sales..
What is the output when executing the code above
Answer: C
NEW QUESTION # 27
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 # 28
A developer has an is Dog function that takes one argument cat. They want to schedule the function to run every minute.
What is the correct syntax for scheduling this function?
Answer:
Explanation:
setInterval(isDog, 60000,'cat');
NEW QUESTION # 29
In the browser, the window object is often used to assign variables that require the broadest scope in an application Node.js application does not have access to the window object by default.
Which two methods are used to address this ?
Choose 2 answers
Answer: C
NEW QUESTION # 30
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