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| Section | Weight | Objectives |
|---|---|---|
| Testing | 7% | - Test doubles and mocks - Code coverage and best practices - Testing frameworks and assertions - Unit testing concepts |
| Asynchronous Programming | 13% | - Event loop and micro/macro tasks - Callbacks and callback hell - Promises and chaining - Async/await syntax - Fetch API and HTTP requests |
| Variables, Types, and Collections | 23% | - Array methods and data manipulation - Variable declaration and initialization - Type coercion and conversion rules - Working with strings, numbers, dates, and booleans - JSON parsing and usage - Truthy and falsy values |
| Debugging and Error Handling | 7% | - Debugging tools and breakpoints - Defensive programming practices - Error types and exception handling - Console methods and logging |
| Browsers and Events | 17% | - Window and document object properties - Event handling, propagation, and delegation - Browser APIs and Web Storage - Script loading and execution order - Document Object Model (DOM) manipulation |
| Server-Side JavaScript | 8% | - Core Node.js modules - Command-line tools and scripts - Module system and require/import - Node.js fundamentals and runtime |
| Objects, Functions, and Classes | 25% | - Function definitions, parameters, and scope - Class syntax, inheritance, and prototypes - Modules and imports/exports - Object creation, properties, and methods - Decorators and advanced function patterns - Closures and execution context |
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NEW QUESTION # 79
Which two options are core Node.js modules?
Choose 2 answers
Answer: B,C
NEW QUESTION # 80
Given two expressions var1 and var2, what are two valid ways to return the concatenation of the two expressions and ensure it is data type string?
Answer: C,D
Explanation:
We want to guarantee that the result is of type string regardless of what var1 and var2 are (numbers, booleans, etc.).
Option A:
String(var1).concat(var2)
* String(var1) converts var1 explicitly to a string.
* .concat(var2) calls String.prototype.concat, which:
* Converts var2 to string if needed.
* Returns a new string that is the concatenation of the two.
* Result is always a string. So A is valid.
Option B:
String.concat(var1 + var2)
* String.concat (as a static method) does not exist. concat is an instance method on string objects, not on the String constructor.
* var1 + var2 might be a number (if both numeric) and used incorrectly here. So B is invalid.
Option C:
var1 + var2
* + can mean:
* String concatenation (if at least one operand is a string).
* Numeric addition (if both operands are numbers).
* If var1 and var2 are both numbers, var1 + var2 will be a number, not a string.
* This does not ensure the result is always a string. So C is not guaranteed to satisfy the requirement.
Option D:
var1.toString() + var2.toString()
* var1.toString() converts var1 to a string (for most primitive/object types).
* var2.toString() does the same.
* Now both operands of + are strings, so the result is string concatenation.
* Result is guaranteed to be a string. So D is valid.
Therefore, the two valid ways are A and D.
Study Guide / Concept References (no links):
* String() conversion vs .toString()
* String.prototype.concat
* + operator overload: numeric addition vs string concatenation
* Type coercion rules for primitives
NEW QUESTION # 81
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 # 82
Refer to the code below:
What is the output after the ode executes successfully?
Answer: A
NEW QUESTION # 83
Given a value, which three options can a developer use to detect of the value is NaN?
Choose 3 answers
Answer: B,C,D
NEW QUESTION # 84
......
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