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| Section | Weight | Objectives |
|---|---|---|
| Debugging and Error Handling | 7% | - Console methods and logging - Debugging tools and breakpoints - Error types and exception handling - Defensive programming practices |
| Variables, Types, and Collections | 23% | - Truthy and falsy values - Variable declaration and initialization - Working with strings, numbers, dates, and booleans - Type coercion and conversion rules - JSON parsing and usage - Array methods and data manipulation |
| Asynchronous Programming | 13% | - Promises and chaining - Async/await syntax - Event loop and micro/macro tasks - Fetch API and HTTP requests - Callbacks and callback hell |
| Objects, Functions, and Classes | 25% | - Function definitions, parameters, and scope - Decorators and advanced function patterns - Modules and imports/exports - Object creation, properties, and methods - Closures and execution context - Class syntax, inheritance, and prototypes |
| Testing | 7% | - Unit testing concepts - Test doubles and mocks - Code coverage and best practices - Testing frameworks and assertions |
| Server-Side JavaScript | 8% | - Command-line tools and scripts - Node.js fundamentals and runtime - Module system and require/import - Core Node.js modules |
| Browsers and Events | 17% | - Event handling, propagation, and delegation - Script loading and execution order - Browser APIs and Web Storage - Document Object Model (DOM) manipulation - Window and document object properties |
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NEW QUESTION # 135
A developer has an ErrorMandler module that contains multiple functions.
What kind of export should be leveraged so that multiple function can be used?
Answer: C
NEW QUESTION # 136
A developer has an ErrorHandler module that contains multiple functions.
What kind of export be leverages so that multiple functions can be used?
Answer: C
NEW QUESTION # 137
Refer to the following code:
Which statement should be added to line 09 for the code to display. The truck 123AB has a weight of 5000 Ib. '?
Answer: A,B,D
NEW QUESTION # 138
Console logging methods that allow string substitution:
Answer: A,B,C,D
Explanation:
The correct answers are B, C, D, and E .
JavaScript browser consoles support string substitution in several console output methods. String substitution means using placeholders such as:
%s
%d
%i
%f
%o
%O
%c
Example:
console.log( " User name is %s and age is %d " , " Alex " , 25);
Output:
User name is Alex and age is 25
The valid console methods from the given options are:
Option
Method
Correct?
Reason
A
message
No
console.message() is not a standard console method.
B
log
Yes
console.log() supports formatted string substitution.
C
assert
Yes
console.assert() can output a formatted message when the assertion is false.
D
info
Yes
console.info() supports formatted output like console.log().
E
error
Yes
console.error() supports formatted output and displays an error-style message.
Example with these valid methods:
console.log( " Name: %s " , " John " );
console.info( " Score: %d " , 95);
console.error( " Error code: %d " , 500);
console.assert(false, " Failed check for user: %s " , " Admin " );
So the verified answers are B, C, D, and E .
NEW QUESTION # 139
Refer to code below:
function Person() {
this.firstName = 'John';
}
Person.prototype ={
Job: x => 'Developer'
};
const myFather = new Person();
const result =myFather.firstName + ' ' + myFather.job();
What is the value of the result after line 10 executes?
Answer: A
NEW QUESTION # 140
......
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