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Salesforce Javascript-Developer-I dumps

Salesforce Javascript-Developer-I Exam Dumps

Salesforce Certified JavaScript Developer (JS-Dev-101)
775 Reviews

Exam Code Javascript-Developer-I
Exam Name Salesforce Certified JavaScript Developer (JS-Dev-101)
Questions 147 Questions Answers With Explanation
Update Date July 27, 2026
Price Was : $81 Today : $45 Was : $99 Today : $55 Was : $117 Today : $65

What Is the Javascript-Developer-I Certification Exam?

The Javascript-Developer-I certification exam is a standardized assessment designed to measure a candidate's knowledge, competencies, and practical understanding within a defined professional field. It serves as the primary requirement for earning the Developers, a credential that represents a recognized level of proficiency in its respective industry. Depending on the field, this may involve theoretical knowledge, applied problem-solving, regulatory understanding, or hands-on procedural competence.

The exam is typically developed and maintained by an accrediting body or professional organization that sets the standards for the Developers. This ensures that anyone who earns the credential has met a consistent benchmark, regardless of where they studied or gained their experience. For many professionals, the Javascript-Developer-I Certification Exam represents a formal checkpoint in their career, one that confirms readiness to take on greater responsibility within their chosen field.

Why the Developers Certification Matters?

Certifications like the Developers exist because industries need a reliable way to verify competence beyond a resume or a job title. Earning this credential signals to employers, clients, and colleagues that a professional has invested time in building a structured foundation of knowledge and has been evaluated against an established standard.

Beyond individual recognition, the Developers certification often supports broader professional development. It can influence hiring decisions, contribute to internal advancement, or serve as a prerequisite for more specialized roles within the field. In many industries, certifications also help standardize expectations across organizations, making it easier for professionals to move between employers or sectors while carrying a credential that is widely understood and respected.

Who Should Take the Javascript-Developer-I Exam?

The Javascript-Developer-I exam is generally relevant to individuals who are either entering a field or looking to formalize skills they have already developed through experience. This can include early-career professionals seeking a credential to support their first steps into the industry, as well as experienced practitioners who want official recognition of knowledge gained on the job.

Students preparing to enter the workforce may also pursue the Javascript-Developer-I exam as a way to strengthen their qualifications before graduating or applying for their first roles. In some fields, employers actively encourage or require staff to pursue this certification as part of ongoing professional development, particularly in industries where standards, safety, or compliance play a significant role in daily responsibilities.

Knowledge and Skills Evaluated in the Salesforce Certified JavaScript Developer (JS-Dev-101)

The Salesforce Certified JavaScript Developer (JS-Dev-101) is built to evaluate both foundational knowledge and the practical judgment needed to apply that knowledge in real situations. Candidates are generally expected to understand core principles and terminology relevant to their field, along with the reasoning behind established procedures, standards, or best practices.

Depending on the industry, this may include understanding regulatory requirements, following established protocols, applying analytical or technical methods, or exercising sound judgment in situations that require careful decision-making. Rather than testing isolated facts in a vacuum, the Salesforce Certified JavaScript Developer (JS-Dev-101) tends to reward candidates who can connect concepts to realistic scenarios, reflecting the kind of thinking expected in day-to-day professional practice.

Javascript-Developer-I Exam Preparation Resources

Preparing for the Javascript-Developer-I certification exam becomes more effective when using high-quality and up-to-date study materials. MyCertsHub provides resources designed to help candidates build knowledge, practice consistently, and become familiar with the actual exam format.

Preparation Features:

  •   Interactive Practice Test Engine for realistic exam simulation
  •   Printable PDF study material for convenient offline preparation
  •   Free Updates For 3 Months
  •   Money-Back Guarantee according to our Refund Policy

How to Prepare for the Javascript-Developer-I Certification Exam?

Effective preparation for the Javascript-Developer-I certification exam usually begins with a clear understanding of the exam's objectives and structure. Reviewing official guidelines or documentation published by the certifying body provides the most accurate picture of what will be covered and how heavily different areas are weighted.

From there, many candidates benefit from building a structured study plan that breaks preparation into manageable sections over a set period of time. A well-organized Javascript-Developer-I Study Guide can help sequence this material logically, especially for those approaching a topic for the first time. Consistent review, paired with realistic practice, tends to produce better retention than concentrated last-minute studying.

Practical experience, where applicable to the field, also plays an important role in preparation. Working through Javascript-Developer-I Practice Questions and a Javascript-Developer-I practice test can help candidates identify gaps in their understanding and become familiar with the format and pacing of the actual exam. In fields where hands-on skill is assessed, supplementing study with real-world practice or supervised experience often makes the difference between recognizing correct information and genuinely understanding it.

Benefits of Earning the Developers Certification

Successfully earning the Developers certification offers benefits that extend well beyond passing a single exam. It provides documented proof of competence that can be referenced on a resume, professional profile, or internal performance review, offering a clear, third-party validation of skill and knowledge.

The credential can also strengthen professional credibility when working with clients, patients, stakeholders, or colleagues who may not be positioned to evaluate technical or specialized knowledge directly. Over time, this recognition often contributes to expanded career opportunities, whether through new responsibilities, higher-level roles, or eligibility for additional certifications that build on this foundational credential.

Prepare for the Javascript-Developer-I Exam with MyCertsHub

Preparing for the Javascript-Developer-I exam is a process that benefits from organized, consistent effort rather than rushed, last-minute review. MyCertsHub is designed to support that process by offering study resources, practice materials, and educational content that help candidates understand what the Salesforce Certified JavaScript Developer (JS-Dev-101) covers and how to approach their preparation thoughtfully.

Whether someone is just beginning to explore the Developers or is in the final stages of reviewing material before their exam date, MyCertsHub aims to serve as a dependable resource throughout that journey. Every candidate's path to certification looks a little different, and the goal remains the same: to provide clear, genuinely useful information that supports real understanding of the subject matter.

Salesforce Javascript-Developer-I Sample Question Answers

Question # 1

Refer to the code below:01 let car1 = new promise((_, reject) =>02 setTimeout(reject, 2000, “Car 1 crashed in”));03 let car2 = new Promise(resolve => setTimeout(resolve, 1500, “Car 2completed”));04 let car3 = new Promise(resolve => setTimeout (resolve, 3000, “Car 3Completed”));05 Promise.race([car1, car2, car3])06 .then(value => (07 let result = $(value) the race. `;08 ))09 .catch( arr => (10 console.log(“Race is cancelled.”, err);11 ));What is the value of result when Promise.race executes?

A. Car 3 completed the race.
B. Car 1 crashed in the race.
C. Car 2 completed the race.
D. Race is cancelled.



Question # 2

Why would a developer specify a package.jason as a developed forge instead of adependency ?

A. It is required by the application in production.
B. It is only needed for local development and testing.
C. Other requiredpackages depend on it for development.
D. It should be bundled when the package is published.



Question # 3

A test has a dependency on database. query. During the test, the dependency is replacedwith an object called database with the method,Calculator query, that returns an array. The developer does notneed to verify how manytimes the method has been called.Which two test approaches describe the requirement?Choose 2 answers

A. White box
B. Stubbing
C. Black box
D. Substitution



Question # 4

A developer is creating a simple webpage with a button. When a userclicks this button for the first time, a message is displayed.The developer wrote the JavaScript code below, but something is missing. Themessage gets displayed every time a user clicks the button, instead of just the first time.01 functionlisten(event) {02 alert ( ‘Hey! I am John Doe’) ;03 button.addEventListener (‘click’, listen);Which two code lines make this code work as required?Choose 2 answers

A. On line 02, use event.first to test if it is the first execution.
B. On line 04, useevent.stopPropagation ( ),
C. On line 04, use button.removeEventListener(‘ click” , listen);
D. On line 06, add an option called once to button.addEventListener().



Question # 5

Given the following code:Let x =null;console.log(typeof x);What is the output of the line 02?

A. “Null”
B. “X”
C. “Object”
D. “undefined”



Question # 6

Which statement accurately describes an aspect of promises?

A. Arguments for the callback function passed to .then() are optional.
B. In a.then() function, returning results is not necessary since callbacks will catch theresult of a previous promise.
C. .then() cannot be added after a catch.
D. .then() manipulates and returns the original promise.



Question # 7

Refer to the code below?LetsearchString = ‘ look for this ’;Which two options remove the whitespace from the beginning of searchString?Choose 2 answers

A. searchString.trimEnd();
B. searchString.trimStart();
C. trimStart(searchString);
D. searchString.replace(/*\s\s*/, ‘’);



Question # 8

developer wants to use a module nameduniversalContainersLib and them call functionsfrom it.How should a developer import every function from the module and then call the fuctionsfooand bar ?

A. import * ad lib from ‘/path/universalContainersLib.js’;lib.foo();lib.bar();
B. import (foo, bar) from ‘/path/universalContainersLib.js’;foo();bar();
C. import all from ‘/path/universalContaineraLib.js’;universalContainersLib.foo();universalContainersLib.bar();
D. import * from ‘/path/universalContaineraLib.js’;universalContainersLib.foo();universalContainersLib.bar();



Question # 9

Which statement phrases successfully?

A. JSON.parse ( ‘ foo ’ );
B. JSON.parse ( “ foo ” );
C. JSON.parse( “ ‘ foo ’ ” );
D. JSON.parse(‘ “ foo ” ’);



Question # 10

Which two console logs outputs NaN?Choose 2 answers

A. console.log(10/ Number(‘5’));
B. console.log(parseInt(‘two’));
C. console.log(10/ ‘’five);
D. console.log(10/0);



Question # 11

Which two console logs outputs NaN?Choose 2 answers

A. console.log(10/ Number(‘5’));
B. console.log(parseInt(‘two’));
C. console.log(10/ ‘’five);
D. console.log(10/0);



Question # 12

Which option is true about the strict mode in imported modules?

A. Add the statement use non-strict, before any other statements in the module to enablenot-strict mode.
B. You can only reference notStrict() functions from the imported module.
C. Imported modules are in strict mode whether you declare them as such or not.
D. Add the statement use strict =false; before any other statements in the module to enablenot- strict mode.



Question # 13

Universal Containers (UC) notices that its application that allows users to search foraccounts makes a network request each time a key is pressed. This results in too manyrequests for the server to handle. Address this problem, UCdecides to implement a debounce function on string changehandler.What are three key steps to implement this debounce function?Choose 3 answers:

A. If there is an existing setTimeout and the search string change, allow the existingsetTimeout to finish,and do not enqueue a new setTimeout.
B. When the search string changes, enqueue the request within a setTimeout.
C. Ensure that the network request has the property debounce set to true.
D. If there is an existing setTimeout and the search string changes,cancel the existingsetTimeout using the persisted timerId and replace it with a new setTimeout.
E. Store the timeId of the setTimeout last enqueued by the search string change handle.



Question # 14

A developer has a web server running with Node.js. The command to start the web serveris node server.js. The web server started havinglatency issues. Instead of a one second turnaround for web requests, the developer nowsees a five second turnaround.Which command can the web developer run to see what the module is doing during thelatency period?

A. NODE_DEBUG=true node server.js
B. DEBUG=http, https node server.js
C. NODE_DEBUG=http,https node server.js
D. DEBUG=true node server.js



Question # 15

GIven a value, which three options can a developer use to detect if the value is NaN?Choose 3 answers !

A. value == NaN
B. Object.is(value, NaN)
C. value === Number.NaN
D. value ! == value
E. Number.isNaN(value)



Question # 16

Consider type coercion, what does the following expression evaluate to?True + 3 + ‘100’ + null

A. 104
B. 4100
C. ‘3100null’
D. ‘4100null’



Question # 17

Refer to the code below:01 const exec = (item, delay) =>{02 newPromise(resolve => setTimeout( () => resolve(item), delay)),03 async function runParallel() {04 Const (result1, result2, result3) = await Promise.all{05 [exec (‘x’, ‘100’) , exec(‘y’, 500), exec(‘z’, ‘100’)]06 );07 return `parallel is done: $(result1)$(result2)$(result3)`;08 }}}Which two statements correctly execute the runParallel () function?Choose 2 answers

A. Async runParallel () .then(data);
B. runParallel ( ). done(function(data){ return data; });
C. runParallel () .then(data);
D. runParallel () .then(function(data) return data



Question # 18

Which code statement correctly retrieves and returns an object from localStorage?

A. const retrieveFromLocalStorage = () =>{return JSON.stringify(window.localStorage.getItem(storageKey));}
B. const retrieveFromLocalStorage = (storageKey) =>{return window.localStorage.getItem(storageKey);}
C. const retrieveFromLocalStorage = (storageKey) =>{returnJSON.parse(window.localStorage.getItem(storageKey));}
D. const retrieveFromLocalStorage = (storageKey) =>{return window.localStorage[storageKey];}



Question # 19

Refer to following code block:Let array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,];Let output =0;For (let num of array){if (output >0){Break;}if(num % 2 == 0){Continue;}Output +=num;What is the value of output after the code executes?

A. 16
B. 36
C. 11
D. 25



Question # 20

Refer to the code below:Let str = ‘javascript’;Str[0] = ‘J’;Str[4] = ’S’;After changing the string index values, the value of str is ‘javascript’. What is the reasonfor this value:

A. Non-primitive values are mutable.
B. Non-primitive values are immutable.
C. Primitive values are mutable.
D. Primitive values are immutable.



Question # 21

In which situation should a developer include a try .. catch block around their function call ?

A. The function has an error that shouldnot be silenced.
B. The function results in an out of memory issue.
C. The function might raise a runtime error that needs to be handled.
D. The function contains scheduled code.



Question # 22

A developer has code that calculates a restaurant bill, but generates incorrectanswerswhile testing the code:function calculateBill ( items ) { let total = 0;total += findSubTotal(items);total += addTax(total);total += addTip(total);return total;}Which option allows the developer to step into each function execution within calculateBill?

A. Using the debugger command on line 05.
B. Using the debugger command on line 03
C. Calling the console.trace (total) method on line 03.
D. Wrapping findSubtotal in a console.log() method.



Question # 23

Refer to code below:function Person() {this.firstName = ’John’;}Person.prototype ={Job: x => ‘Developer’};const myFather = new Person();const result =myFather.firstName + ‘ ‘ + myFather.job();What is the value of the result after line 10 executes?

A. Error: myFather.job is not a function
B. Undefined Developer
C. John undefined
D. John Developer



Question # 24

Refer to the code below:for(let number =2 ; number <= 5 ; number += 1 ) {// insert code statement here}Thedeveloper needs to insert a code statement in the location shown. The codestatement has these requirements:1. Does require an import2. Logs an error when the boolean statement evaluates to false3. Works in both the browser and Node.jsWhich meet the requirements?

A. assert (number % 2 === 0);
B. console.error(number % 2 === 0);
C. console.debug(number % 2 === 0);
D. console.assert(number % 2 === 0);



Question # 25

developer has a web server running with Node.js. The command to start the webserver is node server,js. The web server started having latency issues. Instead of a onesecondturn 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 thelatency period?

A. DEBUG = http, https node server.js
B. NODE_DEBUG =http, https node server.js
C. DEBUG =true node server.js
D. NODE_DEBUG =true node server.js



Feedback That Matters: Reviews of Our Salesforce Javascript-Developer-I Dumps

    Binoya Nagi         Jul 29, 2026

MyCertsHub’s JavaScript-Developer-I study guide was incredibly thorough! The dumps PDF covered all the key topics, from closures to async programming, and the practice questions & answers section helped reinforce my understanding. I particularly appreciated the in-depth explanations provided for each answer because they made learning much simpler. On my first attempt, I passed with an 89% score!

    Thomas Hill         Jul 28, 2026

The practice tests for JavaScript Developer I were right on the money! The questions mirrored the real exam, and the timed mode helped me manage my pace. Strongly recommended!

    Zachary Meyer         Jul 28, 2026

The exam questions were great, but I wish there were more real-world coding examples in the dumps PDF. Still, the material was accurate, and I passed thanks to MyCertsHub!

    Connor Martin         Jul 27, 2026

Thanks to MyCertsHub's score dumps, I passed the JavaScript-Developer-I exam with a score of 92%! The practice tests were hard, but they were exactly like the real thing. Will absolutely utilize this website for my subsequent certification!

    Maximilian Schneider         Jul 27, 2026

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