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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Asynchronous Programming | 13% | - Async/Await syntax - Event loop and execution flow - Callbacks - Asynchronous patterns for business requirements - Promises (creation, chaining, error handling) |
| Topic 2: Testing | 7% | - Writing and modifying unit tests - Unit testing concepts - Test effectiveness evaluation - Test coverage and reliability |
| Topic 3: Debugging and Error Handling | 7% | - Error handling techniques (try/catch/finally) - Breakpoints and code inspection - Console methods for debugging - Custom error types |
| Topic 4: Browser and Events | 17% | - Event handling and listeners - DOM manipulation - Interacting with forms and user input - Event propagation (bubbling and capturing) - Browser-specific APIs - Browser Developer Tools usage |
| Topic 5: Objects, Functions, and Classes | 25% | - Object creation and manipulation - Modules and decorators - Arrow functions - Function declarations and expressions - Prototypal inheritance - ES6 classes and inheritance - Higher-order functions - Execution flow and context - Variable scope and closures |
| Topic 6: Variables, Types, and Collections | 23% | - Strings, numbers, and dates - Primitive and complex data types - Variable declarations and initialization - JSON parsing and manipulation - Truthy and falsy evaluations - Arrays and collections - Type coercion and conversion |
| Topic 7: Server Side JavaScript | 8% | - CLI commands - Node.js fundamentals - Server-side JavaScript implementations - Core Node.js modules - Package management (npm) |
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NEW QUESTION # 91
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: A,B
Explanation:
First, recall the fizzbuzz rules:
* If n divisible by 3 and not by 5 # return ' fizz ' .
* If n divisible by 5 and not by 3 # return ' buzz ' .
* If n divisible by both 3 and 5 # return ' fizzbuzz ' .
* Otherwise # return ' ' (empty string).
Evaluate each test:
Option A:
let res = fizzbuzz(true);
console.assert(res === ' ' );
In JavaScript, when using arithmetic operations with true, it is coerced to the number 1. A typical implementation of fizzbuzz would treat the argument as a number and compute:
* true % 3 # 1 % 3 # 1
* true % 5 # 1 % 5 # 1
So true is effectively treated as 1, which is divisible by neither 3 nor 5. The function should return ' ' . The assertion res === ' ' will pass.
This test covers the scenario "neither divisible by 3 nor 5".
Option B:
let res = fizzbuzz(3);
console.assert(res === ' ' );
* 3 is divisible by 3 but not by 5.
* According to fizzbuzz rules, fizzbuzz(3) should return ' fizz ' .
* This test expects ' ' , so it is incorrect; the assertion would fail in a correct implementation.
Option C:
let res = fizzbuzz(5);
console.assert(res === ' fizz ' );
* 5 is divisible by 5 but not by 3.
* According to fizzbuzz rules, fizzbuzz(5) should return ' buzz ' .
* This test expects ' fizz ' , so it is incorrect.
Option D:
let res = fizzbuzz(15);
console.assert(res === ' fizzbuzz ' );
* 15 is divisible by both 3 and 5.
* According to fizzbuzz rules, fizzbuzz(15) should return ' fizzbuzz ' .
* This assertion correctly matches the expected result, so it is a proper test case.
Thus, the two test cases that correctly test valid fizzbuzz behavior are:
The answer: A, D
Study Guide / Concept References (no links):
* Modulo operator (%) for divisibility checks
* Truthy/number coercion of boolean true in arithmetic (Number(true) === 1)
* Designing unit tests with console.assert
* Typical fizzbuzz logic structure and expected outputs
NEW QUESTION # 92
Which statement accurately describes an aspect of promises?
Answer: B
Explanation:
Evaluate each option:
A). Arguments for .then() are optional.
This is correct.
then() has the signature:
promise.then(onFulfilled?, onRejected?)
Both arguments (onFulfilled and onRejected) are optional.
If a callback is not supplied, JavaScript provides a default pass-through handler.
B). .then() cannot be added after a catch.
Incorrect.
Promises support chaining in any order:
promise
catch(...)
then(...);
After a catch, the chain continues normally.
C). .then() manipulates and returns the original promise.
Incorrect.
then() always returns a new promise , not the original one.
This is fundamental to promise chaining behavior.
D). Returning values in .then() is not necessary.
Incorrect.
If you want the next .then() in the chain to receive a value, the current .then() must explicitly return it:
then(value = > {
return value * 2; // passes to next .then()
})
If nothing is returned, the next .then() receives undefined.
Why A is correct
It is the only statement that accurately describes built-in Promise behavior:
then() accepts optional arguments.
JavaScript Knowledge References (text-only)
* .then(onFulfilled?, onRejected?) accepts optional handlers.
* Promise chaining creates new promises for each .then().
* catch() can be followed by additional .then() calls.
* Returning inside .then() passes values to the next step in the chain.
NEW QUESTION # 93
Refer to the code below:
Considering that JavaScript is single-threaded, what is the output of line 08 after the code executes?
Answer: A
NEW QUESTION # 94
Refer to the code below:
Let str = 'javascript';
Str[0] = 'J';
Str[4] = 'S';
After changing the string index values, the value of str is 'javascript'. What is the reason
for this value:
Answer: A
NEW QUESTION # 95
Which function should a developer use to repeatedly execute code at a fixed time interval?
Answer: A
NEW QUESTION # 96
......
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