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| Section | Weight | Objectives |
|---|---|---|
| Objects, Functions, and Classes | 25% | - ES6 Classes, constructors, methods, and inheritance - Function declarations, expressions, and arrow functions - Object creation, properties, and prototypal inheritance - Higher-order functions and closures - JavaScript modules (export, import) |
| Debugging and Error Handling | 7% | - Logging strategies and debugging techniques - try-catch blocks |
| Testing | 7% | - Automated testing strategies - Test-driven development principles - Unit testing with Jest |
| Browser and Events | 17% | - Event handling, propagation, bubbling, and capturing - DOM manipulation - Browser Developer Tools |
| Variables, Types, and Collections | 23% | - String manipulation and Date objects - JSON parsing and stringification - Type coercion and type conversion - Array manipulation (map, filter, reduce, forEach, find) - Variable declaration (var, let, const, scoping, hoisting) |
| Asynchronous Programming | 13% | - Promises and async/await - Event loop and asynchronous code execution - Callback patterns |
| Server Side JavaScript | 8% | - Salesforce API integration - Node.js applications - Modules and file operations |
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NEW QUESTION # 46
01 function changeValue(obj) {
02 obj.value = obj.value / 2;
03 }
04 const objA = {value: 10};
05 const objB = objA;
06
07 changeValue(objB);
08 const result = objA.value;
What is the value of result after the code executes?
Answer: B
Explanation:
objA is { value: 10 }.
objB = objA; → both variables reference the same object.
changeValue(objB);:
obj.value = obj.value / 2; // modifies the shared object
So:
objA.value becomes 10 / 2 = 5.
Thus result is 5.
________________________________________
NEW QUESTION # 47
for (let number = 2; number <= 5; number += 1) {
// faster code statement here
}
Which statement meets the requirements to log an error when the Boolean statement evaluates to false?
Answer: D
Explanation:
console.assert(condition, message?) logs an assertion error if condition is falsy.
To log an error when number + 2 === 0 is false, use:
console.assert(number + 2 === 0);
Other options are invalid or do not behave as described: console.error always logs, assert alone is not a built-in browser global, and console.classy doesn't exist.
NEW QUESTION # 48
A developer needs the function personalizeWebsiteContent to run when the webpage is fully loaded (HTML and all external resources).
Which implementation should be used?
Answer: B
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge JavaScript defines two main page-loading events:
DOMContentLoaded
Fires when the HTML document has been completely parsed.
External resources like images, stylesheets, iframe contents, etc. may not be loaded yet.
load event on window
Fires when:
HTML is fully parsed
All dependent resources (images, scripts, CSS, fonts, etc.) are fully loaded The requirement states:
"when the webpage is fully loaded (HTML content and all related files)" This aligns exactly with the window load event.
Implementation:
window.addEventListener("load", personalizeWebsiteContent);
This matches option B.
________________________________________
JavaScript knowledge references (text-only)
DOMContentLoaded fires after HTML parsing only.
load fires after all page resources finish loading.
The window object is the correct target for listening to the full load event.
NEW QUESTION # 49
What are two unique features of fat-arrow functions compared to normal function definitions?
Answer: A,D
Explanation:
Arrow functions have two defining characteristics:
Implicit return when written as a single expression:
const fn = () => 5; // returns 5 automatically
This is unique to arrow functions → A is correct.
Lexical this binding:
Arrow functions do not create their own this.
Instead, they use the this value from the surrounding scope → B is correct.
Incorrect options:
C is false: There is no special argument called parentThis.
D is the opposite of arrow function behavior:
Normal functions create their own this; arrow functions do not.
JavaScript Knowledge Reference (text-only)
Arrow functions have lexical this binding.
Arrow functions support implicit return for single expressions.
NEW QUESTION # 50
A developer has two ways to write a function:
Option A:
01 function Monster() {
02 this.growl = () => {
03 console.log("Grr!");
04 }
05 }
Option B:
01 function Monster() {};
02 Monster.prototype.growl = () => {
03 console.log("Grr!");
04 }
After deciding on an option, the developer creates 1000 monster objects. How many growl methods are created with Option A and Option B?
Answer: B
Explanation:
Option A:
this.growl = () => { ... } inside the constructor creates a new function per instance.
For 1000 new Monster(), you get 1000 distinct growl functions, each stored on the instance itself.
Option B:
Monster.prototype.growl = () => { ... } attaches growl to the prototype.
All instances share the same single growl function via the prototype chain.
For 1000 instances, only 1 growl method exists in memory.
So: Option A → 1000; Option B → 1.
NEW QUESTION # 51
......
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