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| Section | Weight | Objectives |
|---|---|---|
| Testing | 7% | - Unit testing concepts - Code coverage and best practices - Testing frameworks and assertions - Test doubles and mocks |
| Browsers and Events | 17% | - Window and document object properties - Document Object Model (DOM) manipulation - Script loading and execution order - Event handling, propagation, and delegation - Browser APIs and Web Storage |
| Debugging and Error Handling | 7% | - Debugging tools and breakpoints - Defensive programming practices - Error types and exception handling - Console methods and logging |
| Asynchronous Programming | 13% | - Async/await syntax - Event loop and micro/macro tasks - Callbacks and callback hell - Fetch API and HTTP requests - Promises and chaining |
| Server-Side JavaScript | 8% | - Node.js fundamentals and runtime - Command-line tools and scripts - Core Node.js modules - Module system and require/import |
| Objects, Functions, and Classes | 25% | - Decorators and advanced function patterns - Function definitions, parameters, and scope - Modules and imports/exports - Closures and execution context - Class syntax, inheritance, and prototypes - Object creation, properties, and methods |
| Variables, Types, and Collections | 23% | - Working with strings, numbers, dates, and booleans - Truthy and falsy values - Type coercion and conversion rules - JSON parsing and usage - Array methods and data manipulation - Variable declaration and initialization |
>> New JavaScript-Developer-I Exam Questions <<
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NEW QUESTION # 37
The developer wants to test the array shown:
Const arr = Array (5) . fill (0);
Which two test are the most accurate for this array? Choose 2 answers
Answer: B
NEW QUESTION # 38
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: A
NEW QUESTION # 39
Refer tothe code below:
What is the value of result after line 10 executes?
Answer: C
NEW QUESTION # 40
What are two unique features of fat-arrow functions compared to normal function definitions?
Answer: B,C
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 References (text-only)
* Arrow functions have lexical this binding.
* Arrow functions support implicit return for single expressions.
NEW QUESTION # 41
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: ${gamename}.... ' );
17 }
18
19 const console16bit = new Console16bit( ' SNEGeneziz ' );
20 console16bit.load( ' Super Monic 3x Force ' );
What should a developer insert at line 15?
Answer: C
Explanation:
A subclass created by:
Console16bit.prototype = Object.create(GameConsole.prototype);
inherits all prototype methods from GameConsole, including load.
To override the inherited method, the correct syntax is to assign a new function to the method name on the prototype:
Console16bit.prototype.load = function(gamename) {
console.log(`${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 References (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 # 42
......
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