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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Server-Side JavaScript | 8% | - Module system and require/import - Core Node.js modules - Command-line tools and scripts - Node.js fundamentals and runtime |
| Topic 2: Asynchronous Programming | 13% | - Async/await syntax - Callbacks and callback hell - Event loop and micro/macro tasks - Fetch API and HTTP requests - Promises and chaining |
| Topic 3: Testing | 7% | - Code coverage and best practices - Test doubles and mocks - Testing frameworks and assertions - Unit testing concepts |
| Topic 4: Browsers and Events | 17% | - Event handling, propagation, and delegation - Document Object Model (DOM) manipulation - Window and document object properties - Script loading and execution order - Browser APIs and Web Storage |
| Topic 5: Debugging and Error Handling | 7% | - Console methods and logging - Defensive programming practices - Error types and exception handling - Debugging tools and breakpoints |
| Topic 6: Objects, Functions, and Classes | 25% | - Decorators and advanced function patterns - Function definitions, parameters, and scope - Object creation, properties, and methods - Closures and execution context - Modules and imports/exports - Class syntax, inheritance, and prototypes |
| Topic 7: Variables, Types, and Collections | 23% | - Array methods and data manipulation - Truthy and falsy values - Variable declaration and initialization - Working with strings, numbers, dates, and booleans - JSON parsing and usage - Type coercion and conversion rules |
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NEW QUESTION # 140
A test searches for:
< button class= " blue " > Checkout < /button >
But the actual HTML is:
< button > Checkout < /button >
The test fails because it expects a class that no longer exists.
What type of test outcome is this?
Answer: B
Explanation:
Definitions:
* False negative # The test reports a failure even though the feature actually works.
* False positive # The test reports success when it should not.
* True positive # Correctly identifies something is working.
* True negative # Correctly identifies something is not working.
In this scenario:
* The checkout button does exist , so the feature works.
* The test fails incorrectly , because it is checking for the wrong selector.
That is the definition of a false negative .
JavaScript Knowledge References (text-only)
* Test outcome classification: false negative = feature works but test fails.
NEW QUESTION # 141
Given the following code:
let x = null;
console.log(typeof x);
What is the output?
Answer: A
NEW QUESTION # 142
A developer tries to retrieve all cookies, then sets a certain key value pair in the cookie. These statements are used:
What is the behavior?
Answer: D
NEW QUESTION # 143
Universal Container(UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions that cause this problem. To verify this, the developer decides to do everything and log the time each of these three suspicious functions consumes.
console.time('Performance');
maybeAHeavyFunction();
thisCouldTakeTooLong();
orMaybeThisOne();
console.endTime('Performance');
Which function can the developer use to obtain the time spent by every one of the three functions?
Answer: C
NEW QUESTION # 144
Code:
01 let array = [1, 2, 3, 4, 4, 5, 4, 4];
02 for (let i = 0; i < array.length; i++) {
03 if (array[i] === 4) {
04 array.splice(i, 1);
05 i--;
06 }
07 }
What is the value of array after execution?
Answer: B
Explanation:
Initial array:
[1, 2, 3, 4, 4, 5, 4, 4]
The loop removes every value equal to 4:
* array.splice(i, 1) removes the element at index i and shifts all later elements left.
* i-- ensures the next index is checked correctly after the shift, preventing skipping elements.
Step-by-step removal:
* Remove the first 4 # array becomes [1,2,3,4,5,4,4]
* Remove next 4 # [1,2,3,5,4,4]
* Remove next 4 # [1,2,3,5,4]
* Remove last 4 # [1,2,3,5]
Final result:
[1,2,3,5]
Option B is correct.
JavaScript Knowledge References (text-only)
* splice(index, deleteCount) removes elements and shifts remaining items.
* Adjusting the loop index when deleting prevents skipping items.
* Arrays update length dynamically after splice().
NEW QUESTION # 145
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