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| Section | Weight | Objectives |
|---|---|---|
| Browser and Events | 17% | - Browser APIs and developer tools - Event handling, propagation, listeners - DOM selection and manipulation |
| Server Side JavaScript | 8% | - Node.js fundamentals and core modules - Package management and CLI tools |
| Asynchronous Programming | 13% | - Event loop and execution flow - Callbacks, promises, async/await |
| Objects, Functions, and Classes | 25% | - ES6 classes, inheritance, modules, decorators - Function types, scope, closures, arrow functions - Object creation, properties, prototypes |
| Debugging and Error Handling | 7% | - Error types and handling strategies - Console usage, breakpoints and debugging techniques |
| Testing | 7% | - Test coverage and improvement - Unit test structure and effectiveness |
| Variables, Types, and Collections | 23% | - Strings, numbers, dates, arrays and methods - Data types, type coercion, truthy/falsy values - Variable declaration and scope - JSON parsing and manipulation |
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87. Frage
Refer to the following code (correcting the missing template literal backticks):
let codeName = 'Bond';
let sampleText = `The name is ${codeName}, Jim ${codeName}`;
A developer is trying to determine if a certain substring is part of a string.
Which three code statements return true?
Antwort: A,D,E
Begründung:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
First, compute sampleText:
let codeName = 'Bond';
let sampleText = `The name is ${codeName}, Jim ${codeName}`;
The template literal evaluates to:
"The name is Bond, Jim Bond"
Now evaluate each statement:
Option A: sampleText.includes('Jim');
String.prototype.includes(substring) returns true if substring occurs anywhere in the string.
sampleText clearly contains "Jim" ("The name is Bond, Jim Bond").
So this returns true.
Option B: sampleText.includes('The', 1);
includes(searchString, position) starts searching from the given position index.
"The name is Bond, Jim Bond" has "The" starting at index 0.
Starting search at index 1 means "The" at index 0 is not considered, and there is no second "The".
So this returns false.
Option C: sampleText.includes('Jim', 4);
"Jim" appears after "The name is Bond, " which is longer than 4 characters; the index of "Jim" is well past 4.
So when searching from index 4, "Jim" is still found.
This returns true.
Option D: sampleText.indexOf('Bond') !== -1;
String.prototype.indexOf(substring) returns:
-1 if the substring is not found,
Otherwise, the starting index of the first occurrence.
"Bond" appears twice in "The name is Bond, Jim Bond".
So sampleText.indexOf('Bond') is some non-negative index (for the first occurrence).
Therefore indexOf('Bond') !== -1 is true.
Option E: sampleText.substring('Jim');
substring expects numeric indexes: substring(startIndex, endIndex?).
If given a string "Jim" as the argument, JavaScript coerces it to a number:
Number('Jim') → NaN
NaN for startIndex is treated as 0.
So sampleText.substring('Jim') is effectively sampleText.substring(0), which returns the full string "The name is Bond, Jim Bond".
This is a string, not a boolean. The question asks "which code statements return true?" This statement returns a string, not the boolean value true.
Thus, the three statements that actually return true (boolean) are:
Study Guide / Concept Reference (no links):
Template literals and ${} interpolation
String.prototype.includes(searchString, position?)
String.prototype.indexOf(substring) and checking for !== -1
String.prototype.substring(start, end?) and argument coercion
Boolean vs non-boolean return types in string methods
________________________________________
88. Frage
A developer has an irresponsible module that contains multiple functions.
What kind of export should be leveraged so that multiple functions can be used?
Antwort: A
89. Frage
A developer is setting up a Node.js server and is creating a script at the root of the source code, index.js, that will start the server when executed. The developer declares a variable that needs the folder location that the code executes from.
Which global variable can be used in the script?
Antwort: A
Begründung:
In Node.js:
__filename is the absolute path to the current file (including file name).
__dirname is the absolute path to the directory that contains the current file.
window.location is a browser-only global, not available in Node.js.
this.path is not a standard Node.js global for path information.
The requirement is:
"the folder location that the code executes from."
That is exactly what __dirname provides.
So the correct choice is __dirname.
Concepts: Node.js globals, __filename, __dirname, Node vs browser environment.
90. Frage
Given the followingcode, what is the value of x?
let x = '15' + (10 * 2);
Antwort: C
91. Frage
Universal Containers (UC) notices that its application that allows users to search for accounts makes a network request each time a key is pressed. This results in too many requests for the server to handle.
* Address this problem, UC decides to implement a debounce function on string change handler.
What are three key steps to implement this debounce function?
Choose 3 answers:
Antwort: A,B,D
92. Frage
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