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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Browser and Events | 17% | - Browser Developer Tools - Event handling, propagation, bubbling, and capturing - DOM manipulation |
| Topic 2: Objects, Functions, and Classes | 25% | - JavaScript modules (export, import) - Higher-order functions and closures - Function declarations, expressions, and arrow functions - Object creation, properties, and prototypal inheritance - ES6 Classes, constructors, methods, and inheritance |
| Topic 3: Asynchronous Programming | 13% | - Callback patterns - Promises and async/await - Event loop and asynchronous code execution |
| Topic 4: Variables, Types, and Collections | 23% | - Array manipulation (map, filter, reduce, forEach, find) - JSON parsing and stringification - Type coercion and type conversion - String manipulation and Date objects - Variable declaration (var, let, const, scoping, hoisting) |
| Topic 5: Debugging and Error Handling | 7% | - Logging strategies and debugging techniques - try-catch blocks |
| Topic 6: Server Side JavaScript | 8% | - Modules and file operations - Salesforce API integration - Node.js applications |
| Topic 7: Testing | 7% | - Automated testing strategies - Test-driven development principles - Unit testing with Jest |
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NEW QUESTION # 114
Given the code below:
FunctionmyFunction(){
A =5;
Var b =1;
}
myFunction();
console.log(a);
console.log(b);
What is the expected output?
Answer: A
NEW QUESTION # 115
Given the code:
01 function GameConsole(name) {
02 this.name = name;
03 }
04
05 GameConsole.prototype.load = function(gamename) {
06 console.log('${this.name} is loading a game: ${gamename}....');
07 }
08
09 function Console16bit(name) {
10 GameConsole.call(this, name);
11 }
12
13 Console16bit.prototype = Object.create(GameConsole.prototype);
14
15 // insert code here
16 console.log('${this.name} is loading a cartridge game: ${gamename}....');
17 }
18
19 const console16bit = new Console16bit('SNEGeneziz');
20 console16bit.load('Super Monic 3x Force');
What should a developer insert at line 15?
Answer: C
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge A subclass created by:
Console16bit.prototype = Object.create(GameConsole.prototype);
inherits all prototype methods from GameConsole, including load.
To override the inherited method, the correct syntax is to assign a new function to the method name on the prototype:
Console16bit.prototype.load = function(gamename) {
console.log(`${this.name} is loading a cartridge game: ${gamename}....`);
};
Why the other options are wrong:
A assigns something to the constructor function itself, not to the prototype method. Invalid.
B attempts to call a function in the left-hand side of an assignment; invalid syntax.
C also uses invalid syntax-prototype methods cannot be defined this way.
D is the correct definition of a prototype method override.
________________________________________
JavaScript Knowledge Reference (text-only)
Methods are overridden by assigning functions to Subclass.prototype.methodName.
Object.create() establishes prototype inheritance.
Constructor functions require prototype method attachment using assignment syntax.
NEW QUESTION # 116
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array.
Which two results occur when running this test on the updated sum3 function? Choose 2 answers
Answer: B,C
NEW QUESTION # 117
Considering type coercion, what does the following expression evaluate to?
True + '13' + NaN
Answer: C
NEW QUESTION # 118
HTML:
<p> The current status of an Order: <span id="status"> In Progress </span> </p> Which JavaScript statement changes 'In Progress' to 'Completed'?
Answer: A
Explanation:
To select an element by ID, JavaScript uses:
document.getElementById("status")
The ID must be passed without any selector prefixes (no dot, no hash).
Then, to update the text inside:
element.innerHTML = 'Completed';
Why the others are wrong:
A uses ".status" which would match a CSS class, not an ID.
B incorrectly prepends #, which is used in CSS selectors but not in getElementById.
D attempts to use .Value with capital V, which is incorrect for DOM text; .value only applies to form elements.
Thus, option C is correct.
JavaScript Knowledge Reference (text-only)
getElementById takes a raw ID string with no prefixes.
innerHTML updates an element's displayed HTML content.
NEW QUESTION # 119
......
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