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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Debugging and Error Handling | 7% | - Console methods for debugging - Breakpoints and code inspection - Error handling techniques (try/catch/finally) - Custom error types |
| Topic 2: Objects, Functions, and Classes | 25% | - Higher-order functions - Function declarations and expressions - Execution flow and context - Modules and decorators - Arrow functions - ES6 classes and inheritance - Object creation and manipulation - Prototypal inheritance - Variable scope and closures |
| Topic 3: Browser and Events | 17% | - Browser Developer Tools usage - Event propagation (bubbling and capturing) - DOM manipulation - Interacting with forms and user input - Browser-specific APIs - Event handling and listeners |
| Topic 4: Testing | 7% | - Unit testing concepts - Writing and modifying unit tests - Test coverage and reliability - Test effectiveness evaluation |
| Topic 5: Server Side JavaScript | 8% | - Core Node.js modules - Server-side JavaScript implementations - Package management (npm) - Node.js fundamentals - CLI commands |
| Topic 6: Asynchronous Programming | 13% | - Callbacks - Async/Await syntax - Promises (creation, chaining, error handling) - Event loop and execution flow - Asynchronous patterns for business requirements |
| Topic 7: Variables, Types, and Collections | 23% | - JSON parsing and manipulation - Truthy and falsy evaluations - Arrays and collections - Strings, numbers, and dates - Variable declarations and initialization - Type coercion and conversion - Primitive and complex data types |
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NEW QUESTION # 29
A developer has a fizzbuzz function that, when passed in a number, returns the following:
* ' fizz ' if the number is divisible by 3.
* ' buzz ' if the number is divisible by 5.
* ' fizzbuzz ' if the number is divisible by both 3 and 5.
* Empty string if the number is divisible by neither 3 nor 5.
Which two test cases properly test scenarios for the fizzbuzz function?
Answer: B,D
Explanation:
The correct answers are B and D .
A strong test case checks whether the actual output matches the expected behavior of the function.
For Option B :
let res = fizzbuzz(15);
console.assert(res === ' fizzbuzz ' );
The number 15 is divisible by both 3 and 5:
15 % 3 === 0
15 % 5 === 0
So the correct return value is:
' fizzbuzz '
That makes option B a valid test.
For Option D :
let res = fizzbuzz(Infinity);
console.assert(res === ' ' );
Infinity is not a normal finite divisible number. In JavaScript:
Infinity % 3
Infinity % 5
produce NaN, and comparisons such as:
Infinity % 3 === 0
are false.
So a typical fizzbuzz implementation would not treat Infinity as divisible by 3 or 5, meaning it should return:
' '
That makes option D a valid test for the "neither divisible by 3 nor 5" path.
Now compare the incorrect options:
Option A is wrong because:
fizzbuzz(3)
should return:
' fizz '
not:
' buzz '
Option C is wrong because the function specification says the function returns strings such as ' fizz ' , ' buzz '
, ' fizzbuzz ' , or ' ' . It does not say the function returns numeric NaN.
So this assertion is not appropriate:
console.assert(isNaN(res));
Therefore, the verified answers are B and D .
NEW QUESTION # 30
Which two implementations of utils.js support foo and bar?
Answer: B,C
Explanation:
The correct answers are A and C because both use named exports for foo and bar.
A module can export multiple values by name:
export { foo, bar };
This allows another file to import them like this:
import { foo, bar } from ' ./utils.js ' ;
Option A is correct because it defines both functions locally and exports both of them as named exports.
const foo = () = > { return ' foo ' ; };
const bar = () = > { return ' bar ' ; };
export { foo, bar };
Option C is also correct after correcting the typing issue so that both foo and bar are imported first:
import { foo, bar } from " ./helpers/utils.js " ;
export { foo, bar };
This is called re-exporting. The module imports foo and bar from another module, then exports them again from utils.js.
Option B is not the best answer for named access because it exports one default object:
export default { foo, bar };
That would require a default import first:
import utils from ' ./utils.js ' ;
utils.foo();
utils.bar();
It does not directly support named imports in the same way as:
import { foo, bar } from ' ./utils.js ' ;
Option D exports a default class. Its foo() and bar() are class instance methods, not named exported functions.
It would require usage like:
import Utils from ' ./utils.js ' ;
const utils = new Utils();
utils.foo();
utils.bar();
So for direct multiple function exports, the correct implementations are A and C .
NEW QUESTION # 31
A developer implements a function that adds a few values.
Which three options can the developer invoke for this function to get a return vale of 10? Choose 3 answers
Answer: A,C,D
NEW QUESTION # 32
Refer to code below:
function Person() {
this.firstName = 'John';
}
Person.prototype ={
Job: x => 'Developer'
};
const myFather = new Person();
const result =myFather.firstName + ' ' + myFather.job();
What is the value of the result after line 10 executes?
Answer: B
NEW QUESTION # 33
Refer to the following code that imports a module named utils:
import (foo, bar) from '/path/Utils.js';
foo() ;
bar() ;
Which two implementations of Utils.js export foo and bar such that the code above runs without error?
Choose 2 answers
Answer: A,D
NEW QUESTION # 34
......
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