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| Section | Weight | Objectives |
|---|---|---|
| Variables, Types, and Collections | 23% | - Variable declaration (var, let, const, scoping, hoisting) - Type coercion and type conversion - JSON parsing and stringification - Array manipulation (map, filter, reduce, forEach, find) - String manipulation and Date objects |
| Debugging and Error Handling | 7% | - Logging strategies and debugging techniques - try-catch blocks |
| Browser and Events | 17% | - Event handling, propagation, bubbling, and capturing - Browser Developer Tools - DOM manipulation |
| Server Side JavaScript | 8% | - Node.js applications - Salesforce API integration - Modules and file operations |
| Asynchronous Programming | 13% | - Event loop and asynchronous code execution - Promises and async/await - Callback patterns |
| Testing | 7% | - Unit testing with Jest - Test-driven development principles - Automated testing strategies |
| Objects, Functions, and Classes | 25% | - JavaScript modules (export, import) - ES6 Classes, constructors, methods, and inheritance - Higher-order functions and closures - Object creation, properties, and prototypal inheritance - Function declarations, expressions, and arrow functions |
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NEW QUESTION # 125
A developer is asked to fix some bugs reported by users. To do that, the developer adds a breakpoint for debugging.
01 function Car(maxSpeed, color) {
02 this.maxSpeed = maxSpeed;
03 this.color = color;
04 }
05 let carSpeed = document.getElementById('carSpeed');
06 debugger;
07 let fourWheels = new Car(carSpeed.value, 'red');
When the code execution stops at the breakpoint on line 06, which two types of information are available in the browser console?
Answer: C,D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
When execution hits the debugger; statement on line 06, JavaScript execution pauses at that point. Most modern browsers (for example, using DevTools) allow you to inspect the current scope, DOM, and various browser APIs in the console.
Let's look at what is available precisely at line 06.
Current code state at the breakpoint:
Lines 01-04 define the Car constructor function.
Line 05 executes:
let carSpeed = document.getElementById('carSpeed');
So at line 06:
carSpeed is a variable containing a reference to a DOM element (the element with id "carSpeed").
Line 07 has not executed yet:
let fourWheels = new Car(carSpeed.value, 'red');
So fourWheels has not been created and is not accessible yet (it is in the temporal dead zone for the let declaration).
Now check each option:
Option A:
"A variable displaying the number of instances created for the Car object" This code does not implement any mechanism to count instances of Car.
There is no static property, global counter, or similar variable tracking the number of Car instances.
At line 06, no instance of Car has even been created yet (new Car(...) is on line 07, which has not run).
Therefore, there is no such variable by default in JavaScript or DevTools.
This option is not available.
Option B:
"The information stored in the window.localStorage property"
At a breakpoint, the console is fully usable to inspect global objects.
window.localStorage is always accessible from the console (assuming standard browser context).
You can type:
window.localStorage
and inspect key/value pairs stored there.
This is independent of the current function or breakpoint line; localStorage is part of the Web Storage API on the window object.
So this information is indeed available in the console at line 06.
Option C:
"The values of the carSpeed and fourWheels variables"
At line 06:
carSpeed has been declared and assigned (line 05), so it is available, and its value (a DOM element) can be inspected.
fourWheels is declared on line 07 with let and has not yet been executed.
Variables declared with let and const are in a temporal dead zone before their declaration line completes.
At line 06, fourWheels is not yet initialized, and attempting to access it would result in a ReferenceError.
Thus, you can inspect carSpeed but not fourWheels. The option explicitly says "the values of the carSpeed and fourWheels variables", which is not correct at this breakpoint, because fourWheels is not available yet.
Option D:
"The style, event listeners and other attributes applied to the carSpeed DOM element" carSpeed holds a reference to a DOM element (document.getElementById('carSpeed')).
In DevTools, you can inspect this element in several ways:
Typing carSpeed in the console.
Inspecting it in the Elements panel.
From the console or Elements panel, you can view:
Its style (inline styles and computed styles).
Event listeners attached to it (using event listener viewer in DevTools).
Other attributes (id, class, etc.).
All of this is accessible at the point where execution is paused.
Therefore, this information is available at the breakpoint.
Conclusion:
B is available (global window.localStorage).
D is available (full inspection of the carSpeed DOM element).
A is not present in this code or environment.
C is partially wrong (only carSpeed exists; fourWheels does not yet).
So the two correct answers are:
Reference of JavaScript knowledge documents or Study Guide (concept names only):
debugger statement and pausing execution
JavaScript execution context and scope at a breakpoint
let declarations and temporal dead zone
Browser DevTools console and inspection of variables
DOM access via document.getElementById and inspection of elements
Web Storage API: window.localStorage
NEW QUESTION # 126
myArraym can have one level, two levels, or more levels.
Which statement flattens myArray when it can be arbitrarily nested?
Answer: B
NEW QUESTION # 127
The developer has a function that prints "Hello" to an input name. To test this,thedeveloper created a function that returns "World". However the following snippet does not print " Hello World".
What can the developer do to change the code to print "Hello World" ?
Answer: D
NEW QUESTION # 128
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?
Answer: A
Explanation:
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:
Answe r: A
Study Guide / Concept Reference (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
NEW QUESTION # 129
Original code:
01 let requestPromise = client.getRequest;
03 requestPromise().then((response) => {
04 handleResponse(response);
05 });
The developer wants to gracefully handle errors from a Promise-based GET request.
Which code modification is correct?
Answer: A
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge Key JavaScript Promise rule:
try...catch does not catch asynchronous errors that occur in Promise chains.
Therefore, the correct way to handle errors in a Promise is:
promise.then(...).catch(...);
Analysis of options:
A and B:
Both wrap asynchronous code in try...catch, which does not catch Promise rejections.
try...catch only catches errors thrown synchronously inside the block.
C:
Correct. A .catch() on the Promise chain handles any error from the Promise returned by requestPromise().
D:
.finally() executes regardless of success or failure, but it does not receive the error object, so it cannot handle the error.
Thus the only valid solution is option C.
________________________________________
JavaScript Knowledge Reference (text-only)
Promise rejections must be handled with .catch().
try...catch only handles synchronous code.
.finally() does not receive a rejection reason.
NEW QUESTION # 130
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