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| Section | Weight | Objectives |
|---|---|---|
| Server Side JavaScript | 8% | - CLI commands - Package management (npm) - Core Node.js modules - Server-side JavaScript implementations - Node.js fundamentals |
| Objects, Functions, and Classes | 25% | - Object creation and manipulation - Function declarations and expressions - Modules and decorators - ES6 classes and inheritance - Prototypal inheritance - Variable scope and closures - Execution flow and context - Arrow functions - Higher-order functions |
| Testing | 7% | - Unit testing concepts - Test coverage and reliability - Test effectiveness evaluation - Writing and modifying unit tests |
| Variables, Types, and Collections | 23% | - Type coercion and conversion - Truthy and falsy evaluations - JSON parsing and manipulation - Variable declarations and initialization - Primitive and complex data types - Strings, numbers, and dates - Arrays and collections |
| Asynchronous Programming | 13% | - Callbacks - Promises (creation, chaining, error handling) - Async/Await syntax - Event loop and execution flow - Asynchronous patterns for business requirements |
| Debugging and Error Handling | 7% | - Breakpoints and code inspection - Error handling techniques (try/catch/finally) - Custom error types - Console methods for debugging |
| Browser and Events | 17% | - Event propagation (bubbling and capturing) - Browser Developer Tools usage - DOM manipulation - Event handling and listeners - Interacting with forms and user input - Browser-specific APIs |
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NEW QUESTION # 53
A developer has an ErrorHandler module that contains multiple functions.
What kind of export should be leveraged so that multiple functions can be used?
Answer: A
NEW QUESTION # 54
Refer to the code below:
What is the result when the Promise in the execute function is rejected?
Answer: B
NEW QUESTION # 55
Refer to the following array:
Let arr1 = [ 1, 2, 3, 4, 5 ];
Which two lines of code result in a second array, arr2 being created such that arr2 is not a reference to arr1?
Answer: C,D
NEW QUESTION # 56
Which statement can a developer apply to increment the browser's navigation history without a page refresh?
Answer: A
NEW QUESTION # 57
Refer to the code below:
let strNumber = ' 12345 ' ;
Which code snippet shows a correct way to convert this string to an integer?
Answer: C
Explanation:
The correct answer is C .
The original option contains a typing error. It should use the existing variable name:
let numberValue = Number(strNumber);
The value of strNumber is a string:
' 12345 '
Using Number() converts the numeric string into a JavaScript number:
12345
So after execution:
typeof numberValue;
returns:
" number "
Professional review of each option:
Option
Result
Explanation:
A
Incorrect
JavaScript does not have a standard global Integer() conversion function.
B
Incorrect
Strings do not have a standard .toInteger() method.
C
Correct
Number(strNumber) correctly converts ' 12345 ' into 12345.
D
Incorrect
This is not valid JavaScript casting syntax.
A commonly used alternative would also be:
let numberValue = parseInt(strNumber, 10);
But from the provided answer choices, the verified answer is C .
NEW QUESTION # 58
......
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