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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Variables, Types, and Collections | 23% | - Strings, numbers, and dates - Type coercion and conversion - Arrays and collections - Primitive and complex data types - Truthy and falsy evaluations - Variable declarations and initialization - JSON parsing and manipulation |
| Topic 2: Debugging and Error Handling | 7% | - Console methods for debugging - Error handling techniques (try/catch/finally) - Custom error types - Breakpoints and code inspection |
| Topic 3: Objects, Functions, and Classes | 25% | - ES6 classes and inheritance - Function declarations and expressions - Prototypal inheritance - Execution flow and context - Higher-order functions - Variable scope and closures - Arrow functions - Modules and decorators - Object creation and manipulation |
| Topic 4: Server Side JavaScript | 8% | - Server-side JavaScript implementations - Node.js fundamentals - CLI commands - Package management (npm) - Core Node.js modules |
| Topic 5: Asynchronous Programming | 13% | - Promises (creation, chaining, error handling) - Event loop and execution flow - Async/Await syntax - Asynchronous patterns for business requirements - Callbacks |
| Topic 6: Browser and Events | 17% | - Browser-specific APIs - Browser Developer Tools usage - Interacting with forms and user input - DOM manipulation - Event handling and listeners - Event propagation (bubbling and capturing) |
| Topic 7: Testing | 7% | - Unit testing concepts - Test coverage and reliability - Writing and modifying unit tests - Test effectiveness evaluation |
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NEW QUESTION # 78
Refer to the code below:
Which two function can replace line 01 and return 58 to sum? Choose 2 answers
Answer: B,D
NEW QUESTION # 79
A developer receives a comment from the Tech lead that the code below gives an error.
Which line edit should be made to make this code run?
Answer: C
NEW QUESTION # 80
A developer is trying to handle an error within a function.
Which code segment shows the correct approach to handle an error without propagating it elsewhere?
Answer: B
NEW QUESTION # 81
A developer wants to use a try...catch statement to catch any error that countSheep () may throw and pass it to a handleError () function.
What is the correct implementation of the try...catch?
A)
B)
C)
D)
Answer: A
NEW QUESTION # 82
Corrected code:
let a = " * " ;
let b = " ** " ;
// x = 3;
console.log(a);
What is displayed when the code executes?
Answer: D
Explanation:
The correct answer is B because variable a is declared and initialized before it is printed.
let a = " * " ;
This creates a block-scoped variable named a and assigns it the string value:
" * "
The line:
// x = 3;
is a comment. JavaScript ignores comments during execution, so this line has no effect.
Then this line runs:
console.log(a);
Since a already exists and contains " * " , the console displays:
* Option A is incorrect because a is defined.
Option C is incorrect because a has an assigned value, so it is not undefined.
Option D is incorrect because a was never assigned null.
Therefore, the verified answer is B .
NEW QUESTION # 83
......
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