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| Section | Weight | Objectives |
|---|---|---|
| Server Side JavaScript | 8% | - Server-side JavaScript implementations - Package management (npm) - Node.js fundamentals - CLI commands - Core Node.js modules |
| Objects, Functions, and Classes | 25% | - Function declarations and expressions - Variable scope and closures - Arrow functions - Modules and decorators - Higher-order functions - ES6 classes and inheritance - Object creation and manipulation - Execution flow and context - Prototypal inheritance |
| Debugging and Error Handling | 7% | - Custom error types - Console methods for debugging - Breakpoints and code inspection - Error handling techniques (try/catch/finally) |
| Testing | 7% | - Test coverage and reliability - Writing and modifying unit tests - Unit testing concepts - Test effectiveness evaluation |
| Asynchronous Programming | 13% | - Asynchronous patterns for business requirements - Promises (creation, chaining, error handling) - Async/Await syntax - Callbacks - Event loop and execution flow |
| Variables, Types, and Collections | 23% | - JSON parsing and manipulation - Variable declarations and initialization - Primitive and complex data types - Type coercion and conversion - Arrays and collections - Truthy and falsy evaluations - Strings, numbers, and dates |
| Browser and Events | 17% | - DOM manipulation - Browser Developer Tools usage - Event propagation (bubbling and capturing) - Browser-specific APIs - Event handling and listeners - Interacting with forms and user input |
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NEW QUESTION # 147
Refer to code below:
console.log(0);
setTimeout(() => (
console.log(1);
});
console.log(2);
setTimeout(() => {
console.log(3);
), 0);
console.log(4);
In which sequence will the numbers be logged?
Answer: D
NEW QUESTION # 148
Cloud Kicks has a class to represent items for sale in an online store, as shown below:
Class Item{
constructor (name, price){
this.name = name;
this.price = price;
}
formattedPrice(){
return 's' + String(this.price);}}
A new business requirement comes in that requests a ClothingItem class that should have all of
the properties and methods of the Item class but will also have properties that are specific to
clothes.
Which line of code properly declares the clothingItem class such that it inherits from
Item?
Answer: D
NEW QUESTION # 149
A developer writes the code below to return a message to a user attempting to register a new username. If the username is available, a variable named nag is declared and assigned a value on line 03.
What is the value of msg when getAvailableabilityMessage ("newUserName") is executed and get Availability ("newUserName") returns true?
Answer: A
NEW QUESTION # 150
01 function Animal(size, type) {
02 this.type = type || ' Animal ' ;
03 this.canTalk = false;
04 }
05
06 Animal.prototype.speak = function() {
07 if (this.canTalk) {
08 console.log( " It spoke! " );
09 }
10 };
11
12 let Pet = function(size, type, name, owner) {
13 Animal.call(this, size, type);
14 this.size = size;
15 this.name = name;
16 this.owner = owner;
17 }
18
19 Pet.prototype = Object.create(Animal.prototype);
20 let pet1 = new Pet();
Given the code above, which three properties are set for pet1?
Answer: A,C,E
Explanation:
When pet1 = new Pet(); is created:
* Inside Pet constructor:
Animal.call(this, size, type);
this.size = size;
this.name = name;
this.owner = owner;
* Animal.call(this, size, type):
* Sets this.type = type || ' Animal ' # ' Animal ' (because type is undefined).
* Sets this.canTalk = false.
* Then this.size, this.name, this.owner are set (to undefined since no args passed), but they do exist as properties .
So as own properties, pet1 has: type, canTalk, size, name, owner.
* speak is defined on Animal.prototype, so pet1.speak exists by inheritance, but is not an own data property created in the constructor.
From the listed options, three important properties directly set by constructor logic and clearly used in behavior are:
* canTalk
* name
* type
Thus, C, D, E.
NEW QUESTION # 151
Refer to the code below:
Const myFunction = arr => {
Return arr.reduce((result, current) =>{
Return result = current;
}, 10};
}
What is the output of this function when called with an empty array ?
Answer: D
NEW QUESTION # 152
......
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