100% Guaranteed Results JavaScript-Developer-I Unlimited 180 Questions [2022]
JavaScript-Developer-I Dumps PDF - Want To Pass JavaScript-Developer-I Fast
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Benefits in Obtaining Salesforce JavaScript-Developer-I Certification
With the introduction of the Lightning Experience by Salesforce, it is possible to develop cool, looking applications for a wide range of tasks. Admins have been able to create beautiful pages for their objects more than ever, with an interface entirely tailored for each user.For developers, the same application has never before been possible for Salesforce developers to create applications that stretch well beyond Salesforce's declarative features. It's all achieved with the use of a JavaScript application for Lightning & Lightning Web components.
The certification for JavaScript Developer I has just been released and fills a large gap in the certification list for Salesforce. Salesforce Developers who want to prove their Lightning skills, but also new entrants into the Salesforce community, are certified to demonstrate that they know what is relevant. A typical Salesforce 60 multi-choice test is split into two parts and is influenced by a super badge (Similar to Developer II certification).
NEW QUESTION 34
Refer to the code below:
What is the result of running line 05?
- A. Neither aPromise or bPromise runs.
- B. Only apromise runs.
- C. Apromise and bpromise run in parallel.
- D. aPromise and bPromise run sequentially.
Answer: A
NEW QUESTION 35
Which option is true about the strict mode in imported modules?
- A. Imported modules are in strict mode whether you declare them as such or not.
- B. Add the statement use strict =false; before any other statements in the module to enable not- strict mode.
- C. Add the statement use non-strict, before any other statements in the module to enable not-strict mode.
- D. You can only reference notStrict() functions from the imported module.
Answer: D
NEW QUESTION 36
Refer to the code below:
let timeFunction =() => {
console.log('Timer called.");
};
let timerId = setTimeout (timedFunction, 1000);
Which statement allows a developer to cancel the scheduled timed function?
- A. clearTimeout(timerId);
- B. removeTimeout(timerId);
- C. removeTimeout(timedFunction);
- D. clearTimeout(timedFunction);
Answer: A
NEW QUESTION 37
A test has a dependency on database.query. During the test the dependency is replaced with an object called database with the method, query, that returns an array. The developer needs to verify how many times the method was called and the arguments used each time.
Which two test approaches describe the requirement?
Choose 2 answers
- A. Mocking
- B. White box
- C. Black box
- D. Integration
Answer: A,B
NEW QUESTION 38
A developer is asked to fix some bugs reported by users. To do that, the developer adds a breakpoint for debugging.
When the code execution stops at the breakpoint on line 06, which two types of information are available In the browser console? Choose 2 answers
- A. The information stored in the window.localStorage property.
- B. The style, event listeners and other attributes applied to the carSpeed DOM element.
- C. A variable's displaying the number of instances created for the Car object.
- D. The value of the carSpeed and fourWheel variables
Answer: A,B
NEW QUESTION 39
Given the code below.
What is logged to the console?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
NEW QUESTION 40
Refer to the code below:
Let textValue = '1984';
Which code assignment shows a correct way to convert this string to an integer?
- A. Let numberValue = textValue.toInteger();
- B. Let numberValue = (Number)textValue;
- C. let numberValue = Number(textValue);
- D. Let numberValue = Integer(textValue);
Answer: C
NEW QUESTION 41
Refer to the code below:
What is the output after the code executes?
- A. ReferenceError: assignment to undeclared variable ''Person''
- B. undefined
- C. ReferenceError: eyeColor is not defined
- D. Developer
Answer: B
NEW QUESTION 42
A developer receives a comment from the Tech lead that the code below gives an error.
Which line edit should be made to make this code run?
- A. 01 let monthname = 'July ';
- B. 03 if (year == 2019) (
- C. 02 const year = 2020;
- D. 02 let year = 2019 ;
Answer: C
NEW QUESTION 43
Which three options show valid methods for creating a fat arrow function? Choose 3 answers
- A. (x, y, z) => (console.log ('executed') ;)
- B. { } => { console.log (executed') ; )
- C. ( ) => { console.log (' executed') ; )
- D. X => {console.log {'executed'} ; }
- E. X, y, z => ( console.log ('executed') ; )
Answer: A,C,D
NEW QUESTION 44
A class was written to represent items for purchase in an online store, and a second class Representing items that are on sale at a discounted price. THe constructor sets the name to the first value passed in. The pseudocode is below:
Class Item {
constructor(name, price) {
... // Constructor Implementation
}
}
Class SaleItem extends Item {
constructor (name, price, discount) {
...//Constructor Implementation
}
}
There is a new requirement for a developer to implement a description method that will return a brief description for Item and SaleItem.
Let regItem =new Item('Scarf', 55);
Let saleItem = new SaleItem('Shirt' 80, -1);
Item.prototype.description = function () { return 'This is a ' + this.name; console.log(regItem.description()); console.log(saleItem.description()); SaleItem.prototype.description = function () { return 'This is a discounted ' + this.name; } console.log(regItem.description()); console.log(saleItem.description()); What is the output when executing the code above ?
- A. This is a Scarf
Uncaught TypeError: saleItem.description is not a function
This is aScarf
This is a discounted Shirt - B. This is aScarf
Uncaught TypeError: saleItem.description is not a function
This is a Shirt
This is a did counted Shirt - C. This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt - D. This is a Scarf
This is a Shirt
This is a discounted Scarf
This is a discounted Shirt
Answer: C
NEW QUESTION 45
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 reason
for this value:
- A. Non-primitive values are mutable.
- B. Primitive values are immutable.
- C. Non-primitive values are immutable.
- D. Primitive values are mutable.
Answer: B
NEW QUESTION 46
Refer to the code below:
Which two statements correctly execute the runparallel () function?
Choose 2 answers
- A. runParallel () , done (function ( data)(return data; }};
- B. runParallel () , then (function ) (date) { } 0;
- C. runParralel () . then (data );
- D. Async runParalled (). Then (data) :
Answer: B,D
NEW QUESTION 47
A test has a dependency on database. query. During the test, the dependency is replaced with an object called database with the method, Calculator query, that returns an array. The developer does not need to verify how many times the method has been called.
Which two test approaches describe the requirement?
Choose 2 answers
- A. Stubbing
- B. White box
- C. Black box
- D. Substitution
Answer: B,D
NEW QUESTION 48
A developer wants to create an object from a function in the browser using the code below:
Function Monster() { this.name = 'hello' };
Const z = Monster();
What happens due to lack of the new keyword on line 02?
- A. Window.name is assigned to 'hello' and the variable z remains undefined.
- B. Window.m is assigned the correct object.
- C. The z variable is assigned the correct object but this.name remains undefined.
- D. The z variable is assigned the correct object.
Answer: A
NEW QUESTION 49
Refer to the following code that performs a basic mathematical operation on a provided
input:
function calculate(num) {
Return (num +10) / 3;
}
How should line 02 be written to ensure that x evaluates to 6 in the line below?
Let x = calculate (8);
- A. Return Number((num +10) /3 );
- B. Return Integer(num +10) /3;
- C. Return (Number (num +10 ) / 3;
- D. Return Number(num + 10) / 3;
Answer: C
NEW QUESTION 50
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
● Will establish a web socket connection and handle receipt of messages to the server
● Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?
- A. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};
- B. try{
ws.connect (( ) => {
console.log('connected to client'); }); - C. ws.connect (( ) => {
console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }}; - D. ws.on ('connect', ( ) => {
console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' , error); });
});
Answer: A
Explanation:
} catch(error) { console.log('ERROR' , error); };
}
NEW QUESTION 51
Which function should a developer use to repeatedly execute code at a fixed time interval?
- A. setPeriod
- B. setInterim
- C. setInterval
- D. setTimeout
Answer: C
NEW QUESTION 52
A developer is required to write a function that calculates the sum of elements in an array but is getting undefined every time the code is executed. The developer needs to find what is missing in the code below.
Which option makes the code work as expected?
- A. Replace line 02 with return arr. map ( (result, current => (
- B. Replace line 03 with if 9 (arr. Length == 0) ( return 0; )
- C. Replace line 05 with return results;
- D. Replace line 04 with result + current ;
Answer: C
NEW QUESTION 53
......
How to Study the Salesforce JavaScript-Developer-I Exam
The best study material one can get is the JavaScript-Developer-I practice exam dumps. To ensure good grades, do attempt the JavaScript-Developer-I practice exams. The JavaScript Developer I from Salesforce typically has 1-2 years of experience as a JavaScript developer with the following JavaScript topics.
Activities
Functions (more functions in higher order)
Monitor (agnostic platform)
Asynchronous Programming
JavaScript on the backend
Objects & Arrays: Data Structures
Strings
Classes
Control of Mistake
Scope of Variables
Item Model Document
Modules
Discharge
To prepare for this test, we advise a combination of practical experience, completion of training courses, pathways and self-study in the areas listed in the examination outline section of this examination guide.
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