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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Objects, Functions, and Classes | 25% | - Modules and decorators - Higher-order functions - Object creation and manipulation - Execution flow and context - Arrow functions - Prototypal inheritance - Function declarations and expressions - ES6 classes and inheritance - Variable scope and closures |
| Topic 2: Browser and Events | 17% | - Browser-specific APIs - Browser Developer Tools usage - Event handling and listeners - DOM manipulation - Interacting with forms and user input - Event propagation (bubbling and capturing) |
| Topic 3: Server Side JavaScript | 8% | - CLI commands - Core Node.js modules - Server-side JavaScript implementations - Package management (npm) - Node.js fundamentals |
| Topic 4: Debugging and Error Handling | 7% | - Breakpoints and code inspection - Custom error types - Error handling techniques (try/catch/finally) - Console methods for debugging |
| Topic 5: Variables, Types, and Collections | 23% | - Variable declarations and initialization - Truthy and falsy evaluations - Primitive and complex data types - Strings, numbers, and dates - Type coercion and conversion - JSON parsing and manipulation - Arrays and collections |
| Topic 6: Testing | 7% | - Unit testing concepts - Test coverage and reliability - Writing and modifying unit tests - Test effectiveness evaluation |
| Topic 7: Asynchronous Programming | 13% | - Async/Await syntax - Callbacks - Event loop and execution flow - Asynchronous patterns for business requirements - Promises (creation, chaining, error handling) |
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NEW QUESTION # 86
Refer to the following code block:
class Animal{
constructor(name){
this.name = name;
}
makeSound(){
console.log(`${this.name} is making a sound.`)
}
}
class Dog extends Animal{
constructor(name){
super(name)
this.name = name;
}
makeSound(){
console.log(`${this.name} is barking.`)
}
}
let myDog = new Dog('Puppy');
myDog.makeSound();
What is the console output?
Answer: A
NEW QUESTION # 87
Refer to the code below:
What is the output of this function when called with an empty array?
Answer: A
NEW QUESTION # 88
Refer to the code below:
class Student {
constructor(name) {
this._name = name;
}
displayGrade() {
console.log(`${this._name} got 70% on test.`);
}
}
class GraduateStudent extends Student {
constructor(name) {
super(name);
this._name = " Graduate Student " + name;
}
displayGrade() {
console.log(`${this._name} got 100% on test.`);
}
}
let student = new GraduateStudent( " Jane " );
student.displayGrade();
What is the console output?
Answer: A
Explanation:
The correct answer is C , after correcting the option text to match the actual code.
The object is created here:
let student = new GraduateStudent( " Jane " );
Because GraduateStudent extends Student, its constructor runs:
constructor(name) {
super(name);
this._name = " Graduate Student " + name;
}
The call to:
super(name);
runs the parent Student constructor first and temporarily sets:
this._name = " Jane " ;
Then this line in the child constructor overwrites that value:
this._name = " Graduate Student " + name;
So the final value of this._name becomes:
" Graduate Student Jane "
Next, this line executes:
student.displayGrade();
Since student is an instance of GraduateStudent, JavaScript uses the overridden displayGrade() method from GraduateStudent, not the parent method from Student.
The executed method is:
displayGrade() {
console.log(`${this._name} got 100% on test.`);
}
Therefore, the console output is:
Graduate Student Jane got 100% on test.
Important correction: the original option C said something like " Better student Jackie got 100% on test. " , but the actual code uses " Graduate Student " and the name " Jane " . The verified corrected answer remains C
.
NEW QUESTION # 89
Which statement accurately describes the behaviour of the async/ await keyworks ?
Answer: C
NEW QUESTION # 90
A developer wants to set up a secure web server with Node.js. The developer create a directory locally called app-server, and the first file is app-server/index, js.
Without using any third-party libraries, what should the developer add to index, js to create the secure web server?
Answer: C
NEW QUESTION # 91
......
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