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| Section | Weight | Objectives |
|---|---|---|
| Variables, Types, and Collections | 23% | - Type coercion and type conversion - JSON parsing and stringification - Array manipulation (map, filter, reduce, forEach, find) - Variable declaration (var, let, const, scoping, hoisting) - String manipulation and Date objects |
| Asynchronous Programming | 13% | - Promises and async/await - Event loop and asynchronous code execution - Callback patterns |
| Debugging and Error Handling | 7% | - Logging strategies and debugging techniques - try-catch blocks |
| Server Side JavaScript | 8% | - Modules and file operations - Salesforce API integration - Node.js applications |
| Testing | 7% | - Test-driven development principles - Automated testing strategies - Unit testing with Jest |
| Browser and Events | 17% | - DOM manipulation - Browser Developer Tools - Event handling, propagation, bubbling, and capturing |
| Objects, Functions, and Classes | 25% | - JavaScript modules (export, import) - Higher-order functions and closures - Function declarations, expressions, and arrow functions - ES6 Classes, constructors, methods, and inheritance - Object creation, properties, and prototypal inheritance |
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NEW QUESTION # 93
At Universal Containers, every team has its own way of copyingJavaScript objects. The code snippet shows an Implementation from one team:
What is the output of the code execution?
Answer: D
NEW QUESTION # 94
Universal Containers recently launched its new landing page to host a crowd-funding campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, it creates more than 50 new HTML items placed randomly insidethe DOM, like the one in the code below:
All the elements includes the same ad-library-item class, They are hidden by default, and they are randomly displayed while the user navigates through the page.
Answer: C
NEW QUESTION # 95
function myFunction() {
a = a + b;
var b = 1;
}
myFunction();
console.log(a);
console.log(b);
Which statement is correct?
Answer: D
Explanation:
The correct answer is A, not D.
Inside myFunction(), the declaration:
var b = 1;
is hoisted to the top of the function scope, but only the declaration is hoisted, not the assignment. So internally, JavaScript treats the function approximately like this:
function myFunction() {
var b;
a = a + b;
b = 1;
}
Now examine this line:
a = a + b;
Before JavaScript can assign a value to a, it must first evaluate the right-hand side:
a + b
At this point:
b
exists locally because var b was hoisted, so its value is:
undefined
However:
a
has not been declared anywhere. Reading an undeclared variable causes a:
ReferenceError
So this line throws an error before assignment happens:
a = a + b;
Because the error occurs on that line, the next line inside the function is never executed:
var b = 1;
Also, because the error is not handled with try...catch, the program stops before reaching:
console.log(a);
console.log(b);
Therefore, the accurate statement is:
Line 02 throws a reference error, therefore line 03 is never executed.
So the verified answer is A.
NEW QUESTION # 96
Refer to the following code block:
class Animal{
constructor(name){
this.name = name;
}
makeSound(){
console.log(`${this.name} ismaking a sound.`)
}
}
class Dog extends Animal{
constructor(name){
super(name)
this.name = name;
}
makeSound(){
console.log(`${this.name} is barking.`)
}
}
let myDog = new Dog('Puppy');
myDog.makeSound();
What is the console output?
Answer:
Explanation:
Puppy is barking
NEW QUESTION # 97
Refer of the string below:
Const str = 'sa;esforce'=;
Which two statement result in the word 'Sale'?
Choose 2 answers
Answer: A,B
NEW QUESTION # 98
......
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