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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Server Side JavaScript | 8% | - CLI commands - Server-side JavaScript implementations - Core Node.js modules - Package management (npm) - Node.js fundamentals |
| Topic 2: Objects, Functions, and Classes | 25% | - ES6 classes and inheritance - Prototypal inheritance - Variable scope and closures - Arrow functions - Object creation and manipulation - Execution flow and context - Modules and decorators - Function declarations and expressions - Higher-order functions |
| Topic 3: Variables, Types, and Collections | 23% | - Type coercion and conversion - Variable declarations and initialization - JSON parsing and manipulation - Arrays and collections - Strings, numbers, and dates - Truthy and falsy evaluations - Primitive and complex data types |
| Topic 4: Asynchronous Programming | 13% | - Event loop and execution flow - Promises (creation, chaining, error handling) - Async/Await syntax - Asynchronous patterns for business requirements - Callbacks |
| Topic 5: Browser and Events | 17% | - Browser-specific APIs - DOM manipulation - Event propagation (bubbling and capturing) - Browser Developer Tools usage - Event handling and listeners - Interacting with forms and user input |
| Topic 6: Debugging and Error Handling | 7% | - Console methods for debugging - Custom error types - Error handling techniques (try/catch/finally) - Breakpoints and code inspection |
| Topic 7: Testing | 7% | - Test coverage and reliability - Writing and modifying unit tests - Unit testing concepts - Test effectiveness evaluation |
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NEW QUESTION # 98
Refer to code below:
Let a ='a';
Let b;
// b = a;
console.log(b);
What is displayed when the code executes?
Answer: D
NEW QUESTION # 99
Refer to the code below:
Const resolveAfterMilliseconds = (ms) => Promise.resolve (
setTimeout (( => console.log(ms), ms ));
Const aPromise = await resolveAfterMilliseconds(500);
Const bPromise = await resolveAfterMilliseconds(500);
Await aPromise, wait bPromise;
What is the result of running line 05?
Answer: C
NEW QUESTION # 100
A developer wrote the following code:
01 let x = object.value;
02
03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 }
The developer has a getNextValue function to execute after handleObjectValue(), but does not want to execute getNextValue() if an error occurs. How can the developer change the code to ensure this behavior?
Answer: C
Explanation:
Requirement:
* getNextValue() should run only if handleObjectValue(x) does not throw an error.
* If an error occurs, handleError(error) should run, and getNextValue() should be skipped.
Option B:
try {
handleObjectValue(x);
getNextValue();
} catch (error) {
handleError(error);
}
Behavior:
* If handleObjectValue(x) succeeds (no error):
* Execution continues to getNextValue();.
* If handleObjectValue(x) throws:
* Control jumps directly to catch, getNextValue() is skipped.
* handleError(error); is called.
This matches the requirement perfectly.
Why others are incorrect:
* A: } then { is invalid JavaScript syntax.
* C:
try {
handleObjectValue(x);
} catch (error) {
handleError(error);
}
getNextValue();
* getNextValue() is called after the try...catch regardless of whether an error occurred. Not acceptable.
* D: finally always runs:
try {
handleObjectValue(x);
} catch (error) {
handleError(error);
} finally {
getNextValue();
}
* getNextValue() will execute in both success and error cases.
Therefore, the correct approach is B.
Concepts: try/catch control flow, finally semantics, placing code inside vs outside try/catch blocks.
NEW QUESTION # 101
Refer to the code below:
What is the output if this function when called with an empty array?
Answer: D
NEW QUESTION # 102
myArraym can have one level, two levels, or more levels.
Which statement flattens myArray when it can be arbitrarily nested?
Answer: C
NEW QUESTION # 103
......
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