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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Asynchronous Programming | 13% | - Promises (creation, chaining, error handling) - Callbacks - Asynchronous patterns for business requirements - Async/Await syntax - Event loop and execution flow |
| Topic 2: Variables, Types, and Collections | 23% | - Variable declarations and initialization - Truthy and falsy evaluations - Primitive and complex data types - Arrays and collections - Type coercion and conversion - Strings, numbers, and dates - JSON parsing and manipulation |
| Topic 3: Server Side JavaScript | 8% | - Core Node.js modules - Node.js fundamentals - CLI commands - Server-side JavaScript implementations - Package management (npm) |
| Topic 4: Objects, Functions, and Classes | 25% | - Higher-order functions - Prototypal inheritance - Variable scope and closures - Function declarations and expressions - Arrow functions - ES6 classes and inheritance - Modules and decorators - Object creation and manipulation - Execution flow and context |
| Topic 5: Browser and Events | 17% | - Interacting with forms and user input - Event propagation (bubbling and capturing) - Browser-specific APIs - DOM manipulation - Event handling and listeners - Browser Developer Tools usage |
| Topic 6: Testing | 7% | - Unit testing concepts - Test coverage and reliability - Writing and modifying unit tests - Test effectiveness evaluation |
| Topic 7: Debugging and Error Handling | 7% | - Error handling techniques (try/catch/finally) - Console methods for debugging - Breakpoints and code inspection - Custom error types |
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58. Frage
Given the code below:
let numValue = 1982;
Which three code segments result in a correct conversion from number to string?
Antwort: A,C,E
Begründung:
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.
59. Frage
A developer wants to use a module called DataPrettyPrint. This module exports one default functioncalled printDate ().
How can a developer import and use the printDate() function?
Antwort: D
60. Frage
Given the code below:
01 function Person(name, email) {
02 this.name = name;
03 this.email = email;
04 }
05
06 const john = new Person( ' John ' , ' john@email.com ' );
07 const jane = new Person( ' Jane ' , ' jane@email.com ' );
08 const emily = new Person( ' Emily ' , ' emily@email.com ' );
09
10 let usersList = [john, jane, emily];
Which method can be used to provide a visual representation of the list of users and to allow sorting by the name or email attribute?
Antwort: C
Begründung:
We have an array of plain objects:
[
{ name: ' John ' , email: ' john@email.com ' },
{ name: ' Jane ' , email: ' jane@email.com ' },
{ name: ' Emily ' , email: ' emily@email.com ' }
]
We want:
* A "visual representation" of the list.
* Ability to sort by name or email in DevTools.
console.table:
* console.table(data) renders data as a table in most browser devtools and Node consoles that support it.
* Each object becomes a row; properties (name, email) become columns.
* Many DevTools UIs allow:
* Clicking column headers to sort by that column.
* Filtering / viewing in a structured way.
So:
console.table(usersList);
Displays a sortable table of users by name or email. This matches the requirement exactly.
Other options:
* console.group(usersList);
* Starts a console group. The argument is just logged as a line label.
* It does not create a table or sortable view; it just groups subsequent logs.
* console.groupCollapsed(usersList);
* Same grouping behavior, but collapsed by default.
* Again, no table or sortable columns.
* console.info(usersList);
* Logs the array in the console, but as a standard log/info.
* You can expand objects, but there is no table view or built-in column sorting.
Therefore, the correct method is:
The answer: A
Study Guide / Concept References (no links):
* console.table for tabular logging
* console.group and console.groupCollapsed for grouped logs
* console.log / console.info standard logging behavior
* DevTools UI support for sorting columns in console.table
61. Frage
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
* Will establish a web socket connection and handle receipt of messages to the server
* Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?
Antwort: D
Begründung:
} catch(error) { console.log('ERROR' , error); };
}
62. Frage
Refer to the code below:
What is the value of foobDienu1 after the code executes?
Antwort: B
63. Frage
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