Salesforce JS-Dev-101 Dumps - Pass Salesforce Certified JavaScript Developer Exam in First Attempt 2026

The syntax:

import printPrice from 'module';

means the module must export its function as a default export:

export default function printPrice() { ... }

Why the others are wrong:

Named exports require curly braces:

import { printPrice } from 'module';

''all export'' and ''multi export'' are not JavaScript terms.

Therefore, printPrice must be the default export.

JavaScript Knowledge Reference (text-only)

Default imports use: import name from 'module'.

Named imports require braces: import { name } from 'module'.

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:

Answe r: B, D

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

The correct answer is B.

This question is about the event-driven programming model commonly used in Node.js. Many Node.js libraries expose an .on() method to register callback functions for specific events.

The correct pattern is:

ws.on('eventName', callbackFunction);

In this case, the developer needs to listen for two events:

'connect'

and:

'error'

The correct implementation is:

ws.on('connect', () => {

console.log('Connected to client');

});

ws.on('error', (error) => {

console.log('ERROR', error);

});

This registers one listener for successful connection and another listener for connection errors.

Why this works professionally:

ws.on('connect', callback) tells the library:

''When the connection event happens, execute this callback.''

ws.on('error', callback) tells the library:

''When an error event happens, execute this callback and pass the error object into it.''

Option A is incorrect because .catch() is used with Promises. The question specifically says the client library is built using events and callbacks, not Promise chaining.

Option D is incorrect because try...catch only catches synchronous errors during the immediate execution of ws.connect(). It will not reliably catch asynchronous connection errors emitted later by the web socket client.

Option C is identical to option B in the provided question. Since the expected answer normally requires selecting one option, B is selected as the verified answer.

Therefore, the verified answer is B.

Inside setCurrentUrl, url is assigned without var, let, or const:

url = window.location.href;

In non--strict mode, this implicitly creates a global variable url on window.

Execution order:

setCurrentUrl(); creates/sets global url to window.location.href.

console.log('The current URL is: ' + url); has access to url in global scope and prints correctly.

Thus:

url has global scope.

Line 02 runs without error and logs a valid string.

So B is correct.