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| Section | Weight | Objectives |
|---|---|---|
| Server-Side JavaScript | 8% | - Command-line tools and scripts - Node.js fundamentals and runtime - Core Node.js modules - Module system and require/import |
| Variables, Types, and Collections | 23% | - Array methods and data manipulation - Type coercion and conversion rules - Truthy and falsy values - Working with strings, numbers, dates, and booleans - JSON parsing and usage - Variable declaration and initialization |
| Debugging and Error Handling | 7% | - Error types and exception handling - Defensive programming practices - Console methods and logging - Debugging tools and breakpoints |
| Browsers and Events | 17% | - Document Object Model (DOM) manipulation - Browser APIs and Web Storage - Window and document object properties - Event handling, propagation, and delegation - Script loading and execution order |
| Testing | 7% | - Unit testing concepts - Code coverage and best practices - Test doubles and mocks - Testing frameworks and assertions |
| Asynchronous Programming | 13% | - Fetch API and HTTP requests - Promises and chaining - Callbacks and callback hell - Async/await syntax - Event loop and micro/macro tasks |
| Objects, Functions, and Classes | 25% | - Modules and imports/exports - Function definitions, parameters, and scope - Closures and execution context - Class syntax, inheritance, and prototypes - Object creation, properties, and methods - Decorators and advanced function patterns |
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NEW QUESTION # 34
A developer is setting up a Node.js server and is creating a script at the root of the source code, index.js, that will start the server when executed. The developer declares a variable that needs the folder location that the code executes from.
Which global variable can be used in the script?
Answer: C
Explanation:
In Node.js:
* __filename is the absolute path to the current file (including file name).
* __dirname is the absolute path to the directory that contains the current file.
* window.location is a browser-only global, not available in Node.js.
* this.path is not a standard Node.js global for path information.
The requirement is:
"the folder location that the code executes from."
That is exactly what __dirname provides.
So the correct choice is __dirname.
Concepts: Node.js globals, __filename, __dirname, Node vs browser environment.
NEW QUESTION # 35
A developer uses a parsed JSON string to work with user information as in the block below:
01 const userInformation ={
02 " id " : "user-01",
03 "email" : "user01@universalcontainers.demo",
04 "age" : 25
Which two options access the email attribute in the object?
Choose 2 answers
Answer: B,C
NEW QUESTION # 36
A test searches for:
< button class= " blue " > Checkout < /button >
But the actual HTML is:
< button > Checkout < /button >
The test fails because it expects a class that no longer exists.
What type of test outcome is this?
Answer: B
Explanation:
Definitions:
* False negative # The test reports a failure even though the feature actually works.
* False positive # The test reports success when it should not.
* True positive # Correctly identifies something is working.
* True negative # Correctly identifies something is not working.
In this scenario:
* The checkout button does exist , so the feature works.
* The test fails incorrectly , because it is checking for the wrong selector.
That is the definition of a false negative .
JavaScript Knowledge References (text-only)
* Test outcome classification: false negative = feature works but test fails.
NEW QUESTION # 37
Correct implementation of try...catch for countsDeep():
Answer: A
Explanation:
The correct answer is B because countsDeep() is executed inside the callback function passed to setTimeout(), and the try...catch block is also placed inside that same callback.
In JavaScript, setTimeout() schedules a function to run later. The outer code finishes first, and the callback runs asynchronously after the delay. Because of this, a try...catch block placed outside setTimeout() cannot catch errors thrown later inside the callback.
Correct logic:
setTimeout(function() {
try {
countsDeep();
} catch (e) {
handleError(e);
}
}, 1000);
Here, when countsDeep() runs after 1000 milliseconds, any error thrown by countsDeep() happens inside the try block. Therefore, the catch (e) block can catch that error and pass it to handleError(e).
Why the other options are incorrect:
A is incorrect because the syntax is invalid JavaScript. A valid try...catch structure must be:
try {
// code
} catch (e) {
// handle error
}
Option A incorrectly writes:
} handleError (e){
catch(e);
}
That is not valid try...catch syntax.
C is incorrect because the try...catch surrounds only the call to setTimeout(), not the later execution of countsDeep(). If countsDeep() throws an error after the timer expires, the outer catch block will not catch it.
D is incorrect for the same reason as C. In the original question, D also had a typing error: it used countSheep() instead of countsDeep(). Even after correcting that typing error, D is still incorrect because the try...catch is outside the asynchronous callback.
NEW QUESTION # 38
Given the code below:
const delay = async delay =>{
return new Promise((resolve,reject)=>{
console.log(1);
setTimeout(resolve,deleay);
});
};
const callDelay = async ()=>{
console.log(2);
const yup = await delay(1000);
console.log(3);
}
console.log(4);
callDelay();
console.log(5);
What is logged to the console?
Answer:
Explanation:
4 2 1 5 3
NEW QUESTION # 39
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