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| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-001 |
| Exam Duration: | 105 minutes |
| Available Languages: | English |
| Exam Price: | USD 200 (may vary by region/tax) |
| Real Exam Qty: | 60 |
| Passing Score: | 65% |
| Certificate Validity Period: | 1 year (maintenance required via Salesforce certification maintenance modules) |
| Related Certifications: | Salesforce Certified Platform Developer I Salesforce Certified JavaScript Developer I Salesforce Certified Platform App Builder |
| Exam Format: | Multiple Select, Multiple Choice |
| Recommended Training: | Salesforce Developer Learning Paths Salesforce Trailhead JavaScript Developer I Prep |
| Exam Registration: | Salesforce Certification Registration (Webassessor) Salesforce Credentials Page |
| Sample Questions: | Salesforce JavaScript-Developer-I Sample Questions |
| Exam Way: | Online proctored or onsite testing via Kryterion Webassessor |
| Pre Condition: | No formal prerequisites, but familiarity with JavaScript and Salesforce platform development is strongly recommended. |
| Official Syllabus URL: | https://trailhead.salesforce.com/credentials/javascriptdeveloper1 |
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Aspirants must know the exam topics before they start of preparation. Because it will help them to prepare for the below conceptsSalesforce JavaScript-Developer-I Exam will include the following topics:
1. Variable, Types, and Collection: 23%
Scenario based codingVariables Creation and InitializationJSON object understanding
2. Object, Functions, and Classes: 25%
Implementation of different functionsUnderstanding of different modules of JavascriptScope of variables and their execution flow
3. Browser and Events: 17%
Handling and propagation of eventsDevelopment tools of browsersUnderstanding of browser specific APIs
4. Asynchronous Programming: 13%
Asynchrounous programming different conceptsMonitoring and management of different loops
5. Server Side Javascript: 8%
Implementation of Node.jsUnderstanding of Node.js CLI commands
6. Testing: 7%
Unit Testingeffectiveness of different tests
NEW QUESTION # 32
Given the code below:
Const copy = JSON.stringify((new String ('false') , new Bolean(false) undefined)); What is the value of copy?
Answer: D
NEW QUESTION # 33
Which two console logs output NaN?
Choose 2 answers | |
Answer: A,C
NEW QUESTION # 34
Refer to the code below:
Let foodMenu1 = ['pizza', 'burger', 'French fries'];
Let finalMenu = foodMenu1;
finalMenu.push('Garlic bread');
What is the value of foodMenu1 after the code executes?
Answer: A
NEW QUESTION # 35
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,B
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 # 36
Refer to the code below:
Let car1 = new Promise((_ , reject) =>
setTimeout(reject, 2000, "car 1 crashed in" =>
Let car2 =new Promise(resolve => setTimeout(resolve, 1500, "car 2 completed")
Let car3 =new Promise(resolve => setTimeout(resolve, 3000, "car 3 completed")
Promise.race(( car1, car2, car3))
.then (value => (
Let result = '$(value) the race.';)}
.catch(arr => {
console.log("Race is cancelled.", err);
});
What is the value of result when Promise.race executes?
Answer: C
NEW QUESTION # 37
......
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