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| Section | Weight | Objectives |
|---|---|---|
| Asynchronous Programming | 13% | - Fetch API and HTTP requests - Callbacks and callback hell - Event loop and micro/macro tasks - Promises and chaining - Async/await syntax |
| Server-Side JavaScript | 8% | - Core Node.js modules - Node.js fundamentals and runtime - Module system and require/import - Command-line tools and scripts |
| Testing | 7% | - Testing frameworks and assertions - Unit testing concepts - Test doubles and mocks - Code coverage and best practices |
| Browsers and Events | 17% | - Script loading and execution order - Event handling, propagation, and delegation - Browser APIs and Web Storage - Window and document object properties - Document Object Model (DOM) manipulation |
| Debugging and Error Handling | 7% | - Console methods and logging - Defensive programming practices - Debugging tools and breakpoints - Error types and exception handling |
| Variables, Types, and Collections | 23% | - Variable declaration and initialization - Working with strings, numbers, dates, and booleans - JSON parsing and usage - Truthy and falsy values - Array methods and data manipulation - Type coercion and conversion rules |
| Objects, Functions, and Classes | 25% | - Class syntax, inheritance, and prototypes - Object creation, properties, and methods - Closures and execution context - Function definitions, parameters, and scope - Modules and imports/exports - Decorators and advanced function patterns |
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NEW QUESTION # 143
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:
Explanation:
Puppy is barking
NEW QUESTION # 144
Refer to the code below:
Let car1 = new Promise((_ , reject) =>
setTimeout(reject, 2000, "car 1 crashed in" =>
Let car2 =new Promise(resolve => setTimeout(resolve, 1500, "car 2 completed") Let car3 =new Promise(resolve => setTimeout(resolve, 3000, "car 3 completed") Promise.race(( car1, car2, car3))
.then (value => (
Let result = '$(value) the race.';)}
.catch(arr => {
console.log("Race is cancelled.", err);
});
What is the value of result when Promise.race executes?
Answer: B
NEW QUESTION # 145
The developer has a function that prints "Hello" to an input name. To test this, thedeveloper created a function that returns "World". However the following snippet does not print " Hello World".
What can the developer do to change the code to print "Hello World" ?
Answer: B
NEW QUESTION # 146
Refer of the string below:
Const str = 'sa;esforce'=;
Which two statement result in the word 'Sale'?
Choose 2 answers
Answer: A,B
NEW QUESTION # 147
A developer wrote the following code:
The developer has a getNextValue function to execute after handleObjectvalue ( ), but does not want to execute getNextValues ( ) If an error occurs.
How can the developer change the code to ensure this behavior?
A)
B)
C)
Answer: B
NEW QUESTION # 148
......
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