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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Debugging and Error Handling | 7% | - Console methods and logging - Defensive programming practices - Error types and exception handling - Debugging tools and breakpoints |
| Topic 2: Testing | 7% | - Code coverage and best practices - Testing frameworks and assertions - Unit testing concepts - Test doubles and mocks |
| Topic 3: Asynchronous Programming | 13% | - Fetch API and HTTP requests - Async/await syntax - Callbacks and callback hell - Promises and chaining - Event loop and micro/macro tasks |
| Topic 4: Objects, Functions, and Classes | 25% | - Closures and execution context - Modules and imports/exports - Decorators and advanced function patterns - Function definitions, parameters, and scope - Object creation, properties, and methods - Class syntax, inheritance, and prototypes |
| Topic 5: Browsers and Events | 17% | - Script loading and execution order - Event handling, propagation, and delegation - Window and document object properties - Browser APIs and Web Storage - Document Object Model (DOM) manipulation |
| Topic 6: Variables, Types, and Collections | 23% | - JSON parsing and usage - Working with strings, numbers, dates, and booleans - Type coercion and conversion rules - Array methods and data manipulation - Variable declaration and initialization - Truthy and falsy values |
| Topic 7: Server-Side JavaScript | 8% | - Module system and require/import - Node.js fundamentals and runtime - Command-line tools and scripts - Core Node.js modules |
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NEW QUESTION # 67
Which statement accurately describes the behavior of the async/await keywords?
Answer: C
Explanation:
When async is added to a function:
async function example() {}
JavaScript guarantees:
* The function always returns a Promise , regardless of what is returned inside.
* Inside the function, await pauses execution until a Promise resolves.
* Code appears synchronous even though it uses asynchronous behavior.
Analysis of each option:
* A incorrect: Not " sometimes " -an async function always returns a Promise.
* B incorrect: Async functions can be called just like normal functions.
* C incorrect: Async/await has nothing to do with classes specifically.
* D correct: This is the standard description: "Async functions behave asynchronously but allow writing code that looks synchronous." JavaScript Knowledge References (text-only)
* async functions always return Promises.
* await pauses execution of the async function.
* Async/await syntax creates synchronous-looking code on top of asynchronous operations.
NEW QUESTION # 68
A developer creates a class that represents a blog post based on the requirement that a
Post should have a body author and view count.
The Code shown Below:
Class Post {
// Insert code here
This.body =body
This.author = author;
this.viewCount = viewCount;
}
}
Which statement should be inserted in the placeholder on line 02 to allow for a variable to be set
to a new instanceof a Post with the three attributes correctly populated?
Answer: A
NEW QUESTION # 69
A developer is required to write a function that calculates the sum of elements in an array but is getting undefined every time the code is executed. The developer needs to find what is missing in the code below.
Which option makes the code work as expected?
Answer: A
NEW QUESTION # 70
A developer removes the HTML class attributes from the check button, so now it is simply:
<button>checkout<button>.
There is a test verify the existence of the checkout button, however it look for a button with class'' blue''. The test fails because no such button is f.
Which type of test category describes this test?
Answer: D
NEW QUESTION # 71
Which three statements are true about promises ?
Choose 3 answers
Answer: A,C,E
NEW QUESTION # 72
......
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