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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Debugging and Error Handling | 7% | - Defensive programming practices - Debugging tools and breakpoints - Console methods and logging - Error types and exception handling |
| Topic 2: Browsers and Events | 17% | - Document Object Model (DOM) manipulation - Script loading and execution order - Window and document object properties - Event handling, propagation, and delegation - Browser APIs and Web Storage |
| Topic 3: Objects, Functions, and Classes | 25% | - Class syntax, inheritance, and prototypes - Function definitions, parameters, and scope - Modules and imports/exports - Closures and execution context - Object creation, properties, and methods - Decorators and advanced function patterns |
| Topic 4: Testing | 7% | - Code coverage and best practices - Testing frameworks and assertions - Unit testing concepts - Test doubles and mocks |
| Topic 5: Server-Side JavaScript | 8% | - Module system and require/import - Command-line tools and scripts - Core Node.js modules - Node.js fundamentals and runtime |
| Topic 6: Variables, Types, and Collections | 23% | - Truthy and falsy values - Type coercion and conversion rules - Variable declaration and initialization - JSON parsing and usage - Working with strings, numbers, dates, and booleans - Array methods and data manipulation |
| Topic 7: Asynchronous Programming | 13% | - Callbacks and callback hell - Promises and chaining - Async/await syntax - Fetch API and HTTP requests - Event loop and micro/macro tasks |
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NEW QUESTION # 90
Which statement accurately describes an aspect of promises?
Answer: B
Explanation:
Evaluate each option:
A). Arguments for .then() are optional.
This is correct.
then() has the signature:
promise.then(onFulfilled?, onRejected?)
Both arguments (onFulfilled and onRejected) are optional.
If a callback is not supplied, JavaScript provides a default pass-through handler.
B). .then() cannot be added after a catch.
Incorrect.
Promises support chaining in any order:
promise
catch(...)
then(...);
After a catch, the chain continues normally.
C). .then() manipulates and returns the original promise.
Incorrect.
then() always returns a new promise , not the original one.
This is fundamental to promise chaining behavior.
D). Returning values in .then() is not necessary.
Incorrect.
If you want the next .then() in the chain to receive a value, the current .then() must explicitly return it:
then(value = > {
return value * 2; // passes to next .then()
})
If nothing is returned, the next .then() receives undefined.
Why A is correct
It is the only statement that accurately describes built-in Promise behavior:
then() accepts optional arguments.
JavaScript Knowledge References (text-only)
* .then(onFulfilled?, onRejected?) accepts optional handlers.
* Promise chaining creates new promises for each .then().
* catch() can be followed by additional .then() calls.
* Returning inside .then() passes values to the next step in the chain.
NEW QUESTION # 91
Refer to the following code block (with corrected template literals using backticks):
01 class Animal {
02 constructor(name) {
03 this.name = name;
04 }
05
06 makeSound() {
07 console.log(`${this.name} is making a sound.`);
08 }
09 }
10
11 class Dog extends Animal {
12 constructor(name) {
13 super(name);
14 this.name = name;
15 }
16 makeSound() {
17 console.log(`${this.name} is barking.`);
18 }
19 }
20
21 let myDog = new Dog( ' Puppy ' );
22 myDog.makeSound();
What is the console output?
Answer: C
Explanation:
* Animal class:
* Has a constructor that sets this.name.
* Has a makeSound method that logs a message using this.name.
* Dog class:
* Extends Animal.
* Its constructor calls super(name) to run the parent constructor, which sets this.name.
* It overrides makeSound() to log:
* console.log(`${this.name} is barking.`);
* Instantiation:
let myDog = new Dog( ' Puppy ' );
myDog.makeSound();
* new Dog( ' Puppy ' ):
* Calls Dog constructor with name = ' Puppy ' .
* Inside, super(name) sets this.name = ' Puppy ' in the Animal constructor.
* Then this.name = name; in the Dog constructor keeps it as ' Puppy ' .
* myDog.makeSound():
* Calls the overridden makeSound() in Dog.
* Logs: " Puppy is barking. "
No reference errors, no undefined; the output is:
Puppy is barking.
Study Guide Concepts:
* ES6 classes and inheritance (extends)
* super() in subclass constructors
* Method overriding in subclasses
* Template literals: `${this.name} ...`
NEW QUESTION # 92
Given the code below:
Which method can be provide a visual representation of the list if users and to allow sorting by the name or email attributes.
Answer: D
NEW QUESTION # 93
A developer has two ways to write a function:
Option A:
function Monster() {
This.growl = () => {
Console.log ("Grr!");
}
}
Option B:
function Monster() {};
Monster.prototype.growl =() => {
console.log("Grr!");
}
After deciding on an option, the developer creates 1000 monster objects.
How many growl methods are created with Option A Option B?
Answer: B
NEW QUESTION # 94
A class was written to represent items for purchase in an online store, and a second class
Representing items that are on sale at a discounted price. THe constructor sets the name to the
first value passed in. The pseudocode is below:
Class Item {
constructor(name, price) {
... // Constructor Implementation
}
}
Class SaleItem extends Item {
constructor (name, price, discount) {
...//Constructor Implementation
}
}
There is a new requirement for a developer to implement a description method that will return a
brief description for Item and SaleItem.
Let regItem =new Item('Scarf', 55);
Let saleItem = new SaleItem('Shirt' 80, -1);
Item.prototype.description = function () { return 'This is a ' + this.name;
console.log(regItem.description());
console.log(saleItem.description());
SaleItem.prototype.description = function () { return 'This is a discounted ' +
this.name; }
console.log(regItem.description());
console.log(saleItem.description());
What is the output when executing the code above ?
Answer: B
NEW QUESTION # 95
......
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