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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Browsers and Events | 17% | - Event handling, propagation, and delegation - Window and document object properties - Script loading and execution order - Browser APIs and Web Storage - Document Object Model (DOM) manipulation |
| Topic 2: Debugging and Error Handling | 7% | - Error types and exception handling - Console methods and logging - Defensive programming practices - Debugging tools and breakpoints |
| Topic 3: Server-Side JavaScript | 8% | - Module system and require/import - Core Node.js modules - Node.js fundamentals and runtime - Command-line tools and scripts |
| Topic 4: Testing | 7% | - Code coverage and best practices - Test doubles and mocks - Unit testing concepts - Testing frameworks and assertions |
| Topic 5: Asynchronous Programming | 13% | - Event loop and micro/macro tasks - Async/await syntax - Fetch API and HTTP requests - Callbacks and callback hell - Promises and chaining |
| Topic 6: Objects, Functions, and Classes | 25% | - Modules and imports/exports - Closures and execution context - Function definitions, parameters, and scope - Class syntax, inheritance, and prototypes - Decorators and advanced function patterns - Object creation, properties, and methods |
| Topic 7: Variables, Types, and Collections | 23% | - Variable declaration and initialization - Array methods and data manipulation - Truthy and falsy values - Type coercion and conversion rules - JSON parsing and usage - Working with strings, numbers, dates, and booleans |
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NEW QUESTION # 52
A developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality.
The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Given the code and the information the developer has, which code logs an error at boot time with an event?
A)
B)
C)
D)
Answer: C
NEW QUESTION # 53
The developer wants to test this code:
Const toNumber =(strOrNum) => strOrNum;
Which two tests are most accurate for this code?
Choose 2 answers
Answer: C,D
NEW QUESTION # 54
Refer to the code below:
01 function changeValue(param) {
02 param = 5;
03 }
04 let a = 10;
05 let b = a;
06
07 changeValue(b);
08 const result = a + ' - ' + b;
What is the value of result when the code executes?
Answer: D
Explanation:
We must understand pass-by-value for primitives in JavaScript.
* Initial values:
let a = 10;
let b = a; // b gets a copy of the value 10
So:
* a is 10
* b is 10 (independent copy)
* Function call:
changeValue(b);
Function definition:
function changeValue(param) {
param = 5;
}
* param receives the value of b, which is 10.
* Inside the function, param is a local variable .
* param = 5; changes only this local copy.
* It does not affect b outside the function.
After the function call:
* a is still 10.
* b is still 10.
* Result:
const result = a + ' - ' + b;
* a is 10.
* b is 10.
* String concatenation: ' 10 - 10 ' .
So result is:
" 10 - 10 "
Therefore, the correct option is:
The answer: D
Study Guide Concepts:
* Primitive values (numbers, strings, booleans) are passed by value
* Function parameters as local variables
* String concatenation with +
* Difference between mutating references vs primitives
NEW QUESTION # 55
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: C
NEW QUESTION # 56
Refer to the code below:
What is the value result after line 10 executes?
Answer: B
NEW QUESTION # 57
......
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