DOWNLOAD the newest FreeDumps JavaScript-Developer-I PDF dumps from Cloud Storage for free: https://drive.google.com/open?id=1bOh48Za4ZxykC8vybCnaQwCKnr6QvBbz
The Salesforce Certified JavaScript Developer (JS-Dev-101) (JavaScript-Developer-I) practice questions (desktop and web-based) are customizable, meaning users can set the questions and time according to their needs to improve their discipline and feel the real-based exam scenario to pass the Salesforce JavaScript-Developer-I Certification. Customizable mock tests comprehensively and accurately represent the actual Salesforce JavaScript-Developer-I certification exam scenario.
| Section | Weight | Objectives |
|---|---|---|
| Browsers and Events | 17% | - Document Object Model (DOM) manipulation - Browser APIs and Web Storage - Event handling, propagation, and delegation - Script loading and execution order - Window and document object properties |
| Server-Side JavaScript | 8% | - Module system and require/import - Core Node.js modules - Command-line tools and scripts - Node.js fundamentals and runtime |
| Debugging and Error Handling | 7% | - Defensive programming practices - Debugging tools and breakpoints - Console methods and logging - Error types and exception handling |
| Objects, Functions, and Classes | 25% | - Modules and imports/exports - Decorators and advanced function patterns - Object creation, properties, and methods - Function definitions, parameters, and scope - Class syntax, inheritance, and prototypes - Closures and execution context |
| Testing | 7% | - Code coverage and best practices - Testing frameworks and assertions - Test doubles and mocks - Unit testing concepts |
| Asynchronous Programming | 13% | - Promises and chaining - Callbacks and callback hell - Event loop and micro/macro tasks - Async/await syntax - Fetch API and HTTP requests |
| Variables, Types, and Collections | 23% | - Working with strings, numbers, dates, and booleans - JSON parsing and usage - Array methods and data manipulation - Type coercion and conversion rules - Truthy and falsy values - Variable declaration and initialization |
>> Training JavaScript-Developer-I Solutions <<
Do you want to pass JavaScript-Developer-I practice test in your first attempt with less time? Then you can try our latest training certification exam materials. We not only provide you valid JavaScript-Developer-I exam answers for your well preparation, but also bring guaranteed success results to you. The JavaScript-Developer-I pass review written by our IT professionals is the best solution for passing the technical and complex certification exam.
NEW QUESTION # 103
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: A,C
Explanation:
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:
The answer: B, D
References 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 # 104
In the browser, the window object is often used to assign variables that require the broadcast scope in an application Node is application do not have access to the window object by default.
Which two methods are used to address this? Choose 2 answer
Answer: A,C
NEW QUESTION # 105
A developer is leading the creation of a new web server for their team that will fulfill API requests from an existing client.
The team wants a web server that runs on Node.Js, and they want to use the new web framework Minimalist.Js. The lead developer wants to advocate for a more seasoned back-end framework that already has a community around it.
Which two frameworks could the lead developer advocate for?
Choose 2 answers
Answer: A,C
NEW QUESTION # 106
developer has a web server running with Node.js. The command to start the web server is node server,js. The web server started having latency issues. Instead of a one second turn around for web requests, the developer now sees a five second turnaround, Which command can the web developer run to see what the module is doing during the latency period?
Answer: D
NEW QUESTION # 107
Given the HTML below:
< div >
< div id= " row-uc " > Universal Containers < /div >
< div id= " row-as " > Applied Shipping < /div >
< div id= " row-bt " > Burlington Textiles < /div >
< /div >
Which statement adds the priority-account CSS class to the Applied Shipping row?
Answer: B
Explanation:
* document.querySelector( ' #row-as ' ) returns the single element with id row-as.
* That element has a classList property with add, remove, etc.
Correct usage:
document.querySelector( ' #row-as ' ).classList.add( ' priority-account ' ); Why others are wrong:
* A: querySelectorAll returns a NodeList, not a single element, so it does not have a classList property.
* C: DOM elements do not have a classes array or push; they have classList.
* D: document.getElementById( ' row-as ' ) is fine to get the element, but there is no addClass method in standard DOM; that's a jQuery-style API, not vanilla JS.
NEW QUESTION # 108
......
Belive it or not, our efficient and authoritative JavaScript-Developer-I exam materials are always here waiting for you to provide you with the best help of JavaScript-Developer-I exam preparation. Maybe you just need a JavaScript-Developer-I exam certification to realize your dream of promotion. We know that impulse spending will make you regret, so we suggest that you first download our free demo to check before purchasing. You can easily download our free demo of JavaScript-Developer-I Exam; come on and try it.
JavaScript-Developer-I Guaranteed Success: https://www.freedumps.top/JavaScript-Developer-I-real-exam.html
BTW, DOWNLOAD part of FreeDumps JavaScript-Developer-I dumps from Cloud Storage: https://drive.google.com/open?id=1bOh48Za4ZxykC8vybCnaQwCKnr6QvBbz