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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Asynchronous Programming | 13% | - Promises (creation, chaining, error handling) - Event loop and execution flow - Asynchronous patterns for business requirements - Async/Await syntax - Callbacks |
| Topic 2: Server Side JavaScript | 8% | - Server-side JavaScript implementations - Node.js fundamentals - Package management (npm) - CLI commands - Core Node.js modules |
| Topic 3: Debugging and Error Handling | 7% | - Error handling techniques (try/catch/finally) - Breakpoints and code inspection - Custom error types - Console methods for debugging |
| Topic 4: Variables, Types, and Collections | 23% | - Primitive and complex data types - Strings, numbers, and dates - Arrays and collections - Type coercion and conversion - Variable declarations and initialization - Truthy and falsy evaluations - JSON parsing and manipulation |
| Topic 5: Browser and Events | 17% | - Interacting with forms and user input - Browser-specific APIs - Event propagation (bubbling and capturing) - Event handling and listeners - DOM manipulation - Browser Developer Tools usage |
| Topic 6: Testing | 7% | - Unit testing concepts - Test coverage and reliability - Test effectiveness evaluation - Writing and modifying unit tests |
| Topic 7: Objects, Functions, and Classes | 25% | - Execution flow and context - Function declarations and expressions - Variable scope and closures - Higher-order functions - Arrow functions - ES6 classes and inheritance - Modules and decorators - Object creation and manipulation - Prototypal inheritance |
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NEW QUESTION # 123
Given the code below:
let numValue = 1982;
Which three code segments result in a correct conversion from number to string?
Answer: A,D,E
Explanation:
We want to convert the number 1982 to a string.
Check each option:
* A. numValue.toText()
* There is no standard toText() method on numbers.
* This will result in TypeError: numValue.toText is not a function.
* B. String(numValue);
* String() as a function converts its argument to a string.
* String(1982) returns " 1982 " .
* This is correct.
* C. ' ' + numValue;
* ' ' is a string; + with a string operand performs string concatenation.
* ' ' + 1982 # " 1982 " .
* This is a common shorthand for number-to-string conversion.
* D. numValue.toString();
* Number.prototype.toString() converts the number to its string representation.
* 1982..toString() or (1982).toString() returns " 1982 " .
* For the variable, numValue.toString() is valid: " 1982 " .
* E. (String)numValue;
* This is not valid JavaScript casting syntax; it is more like a C/Java-style cast.
* In JavaScript, that is parsed as a grouping expression (String) and then numValue; it does not convert numValue to a string.
Thus the correct answers are:
* B. String(numValue);
* C. ' ' + numValue;
* D. numValue.toString();
Relevant concepts: primitive type conversion, String() casting, .toString(), coercion via + with strings.
NEW QUESTION # 124
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: B
NEW QUESTION # 125
Given the following code:
What is the output of line 02?
Answer: C
NEW QUESTION # 126
Which statement can a developer apply to increment the browser's navigation history without a page refresh?
Answer: B
NEW QUESTION # 127
A developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality.
The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Given the code and the information the developer has, which code logs an error at boot time with an event?
A)
B)
C)
D)
Answer: C
NEW QUESTION # 128
......
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