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| Section | Weight | Objectives |
|---|---|---|
| Testing | 7% | - Test-driven development principles - Unit testing with Jest - Automated testing strategies |
| Browser and Events | 17% | - Event handling, propagation, bubbling, and capturing - Browser Developer Tools - DOM manipulation |
| Debugging and Error Handling | 7% | - try-catch blocks - Logging strategies and debugging techniques |
| Variables, Types, and Collections | 23% | - Type coercion and type conversion - Array manipulation (map, filter, reduce, forEach, find) - String manipulation and Date objects - JSON parsing and stringification - Variable declaration (var, let, const, scoping, hoisting) |
| Server Side JavaScript | 8% | - Modules and file operations - Node.js applications - Salesforce API integration |
| Objects, Functions, and Classes | 25% | - JavaScript modules (export, import) - ES6 Classes, constructors, methods, and inheritance - Higher-order functions and closures - Function declarations, expressions, and arrow functions - Object creation, properties, and prototypal inheritance |
| Asynchronous Programming | 13% | - Promises and async/await - Event loop and asynchronous code execution - Callback patterns |
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NEW QUESTION # 146
developer wants to use a module named universalContainersLib and them callfunctions from it.
How should a developer import every function from the module and then call the functions foo and bar ?
Answer: B
NEW QUESTION # 147
A class was written to represent items for purchase in an online store, and a secondclass Representing items that are on sale at a discounted price. THe constructor sets the name to the first value passed in. The pseudocode is below:
Class Item {
constructor(name, price) {
... // Constructor Implementation
}
}
Class SaleItem extends Item {
constructor (name, price, discount) {
...//Constructor Implementation
}
}
There is a new requirement for a developer to implement a description method that will return a brief description for Item and SaleItem.
Let regItem =new Item('Scarf', 55);
Let saleItem = new SaleItem('Shirt' 80, -1);
Item.prototype.description = function () { return 'This is a ' + this.name; console.log(regItem.description()); console.log(saleItem.description()); SaleItem.prototype.description = function () { return 'This is a discounted ' + this.name; } console.log(regItem.description()); console.log(saleItem.description()); What is the output when executing the code above ?
Answer: D
NEW QUESTION # 148
Code:
01 const sayHello = (name) => {
02 console.log('Hello ', name);
03 };
04
05 const world = () => {
06 return 'World';
07 };
08
09 sayHello(world);
This does not print "Hello World".
What change is needed?
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
Currently:
sayHello expects a value name and prints it.
world is a function that returns 'World'.
sayHello(world); passes the function object itself, not the result of calling it.
So name inside sayHello is a function, not the string "World".
To keep the call sayHello(world) yet get "World", sayHello must call the function parameter:
const sayHello = (name) => {
console.log('Hello', name());
};
Now:
sayHello(world) passes the function.
Inside sayHello, name() calls world(), which returns "World".
The console logs "Hello World".
Why the others are wrong:
B: Changing line 7 to }(); would attempt to IIFE the function definition and break the declaration.
C: sayHello(world)() would try to call the return value of sayHello, which is undefined, causing an error.
D: Changing world to a function declaration does not change the fact that it is passed as a function reference; sayHello still prints the function object, not 'World'.
________________________________________
NEW QUESTION # 149
Which function should a developer use to repeatedly execute code at a fixed interval ?
Answer: B
NEW QUESTION # 150
Which statement allows a developer to update the browser navigation history without a page refresh?
Answer: A
Explanation:
The correct answer is C.
The browser provides the History API through:
window.history
To add a new entry to the browser's session history without refreshing the page, JavaScript uses:
window.history.pushState(state, title, url);
So the valid statement is:
window.history.pushState(newStateObject, '', null);
This updates the browser history stack without forcing a full page reload. It is commonly used in single-page applications when changing views or routes dynamically.
The method accepts three arguments:
window.history.pushState(stateObject, title, url);
stateObject stores custom data associated with the history entry.
title is usually passed as an empty string because many browsers ignore it.
url optionally changes the displayed URL. Passing null means no new URL is provided.
Option A is incorrect because:
window.customHistory
is not the standard browser History API object.
Option B is incorrect because:
createState()
is not a valid History API method.
Option D is incorrect because:
updateState()
is not a valid History API method.
The correct browser API method is:
window.history.pushState()
Therefore, the verified answer is C.
NEW QUESTION # 151
......
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