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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.
Forms of data and operators
Modules
Strings
Scope of Variables
Control of Mistake
Item Model Document
Classes
Conversion type (inclusive versus explicit)
JavaScript on the backend
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.
NEW QUESTION 29
Refer to the code below:
Let inArray =[ [ 1, 2 ] , [ 3, 4, 5 ] ];
Which two statements result in the array [1, 2, 3, 4, 5] ?
Choose 2 answers
- A. [ ]. concat ( [ ....inArray ] );
- B. [ ]. concat.apply(inArray, [ ]);
- C. [ ]. Concat.apply ([ ], inArray);
- D. [ ]. Concat (... inArray);
Answer: C,D
NEW QUESTION 30
Refer to code below:
console.log(0);
setTimeout(() => (
console.log(1);
});
console.log(2);
setTimeout(() => {
console.log(3);
), 0);
console.log(4);
In which sequence will the numbers be logged?
- A. 02431
- B. 02413
- C. 0
- D. 01234
Answer: B
NEW QUESTION 31
There is a new requirement for a developer to implement a currPrice method that will return the current price of the item or sales..
What is the output when executing the code above
- A. 50
Uncaught TypeError: saleItem,desrcription is not a function
50
80 - B. 50
80
Uncaught Reference Error:this,discount is undefined
72 - C. 50
80
50
72 - D. 50
80
72
Answer: C
NEW QUESTION 32
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?
- A. [ 'pizza','Burger', 'French fires']
- B. [ 'Garlic bread']
- C. [ 'pizza','Burger', 'French fires', 'Garlic bread']
- D. [ 'Garlic bread' , 'pizza','Burger', 'French fires' ]
Answer: A
NEW QUESTION 33
GIven a value, which three options can a developer use to detect if the value is NaN?
Choose 3 answers !
- A. Object.is(value, NaN)
- B. value === Number.NaN
- C. value == NaN
- D. Number.isNaN(value)
- E. value ! == value
Answer: C,D
NEW QUESTION 34
developer is trying to convince management that their team will benefit from using Node.js for a backend server that they are going to create. The server will be a web server that handles API requests from a website that the team has already built using HTML, CSS, and JavaScript.
Which three benefits of Node.js can the developer use to persuade their manager?
Choose 3 answers:
- A. Uses non-blocking functionality for performant request handling .
- B. Executes server-side JavaScript code to avoid learning a new language.
- C. Performs a static analysis on code before execution to look for runtime errors.
- D. Installs with its own package manager to install and manage third-party libraries.
- E. Ensures stability with one major release every few years.
Answer: A,C,D
NEW QUESTION 35
A developer wants to iterate through an array of objects and count the objects and count the objects whose property value, name, starts with the letter N.
Const arrObj = [{"name" : "Zach"} , {"name" : "Kate"},{"name" : "Alise"},{"name" : "Bob"},{"name" :
"Natham"},{"name" : "nathaniel"}
Refer to the code snippet below:
01 arrObj.reduce(( acc, curr) => {
02 //missing line 02
02 //missing line 03
04 ). 0);
Which missing lines 02 and 03 return the correct count?
- A. Const sum = curr.name.startsWith('N') ? 1: 0;
Return acc +sum - B. Const sum = curr.startsWith('N') ? 1: 0;
Return acc +sum - C. Const sum = curr.startsWIth('N') ? 1: 0;
Return curr+ sum - D. Const sum = curr.name.startsWIth('N') ? 1: 0;
Return curr+ sum
Answer: A
NEW QUESTION 36
In which situation should a developer include a try... catch block around their function call?
- A. The function results in an out of memory issue.
- B. The function might raise a runtime error that needs to be handled.
- C. The function contains scheduled code.
- D. The function has an error that should not be silenced.
Answer: B
NEW QUESTION 37
Refer to the HTML below:
Which JavaScript statement results in changing ''Tony'' to ''Mr. T. ''?
- A. Document.querySelectorAll ( '#main li, Tony ' ) innerHTNL = Mr, T , ' ;
- B. Document.querySelector (''#main li:nth-child (2) ') , innerHTML = 'Mr . T ';
- C. Document.querySelector (' '#main li:second-child') innerHTML, = Mr, T, ';
- D. Document.querySelectorAll ('#main # TONY ') , innerHTML = Mr, T , ' ;
Answer: D
NEW QUESTION 38
Refer to the code below:
Async funct on functionUnderTest(isOK) {
If (isOK) return 'OK' ;
Throw new Error('not OK');
)
Which assertion accuretely tests the above code?
- A. Console.assert (await functionUnderTest(true), ' not OK ')
- B. Console.assert (await functionUnderTest(true), ' OK ')
- C. Console.assert (await functionUnderTest(true), 'OK')
- D. Console.assert (await functionUnderTest(true), ' not OK ')
Answer: C
NEW QUESTION 39
developer wants to use a module named universalContainersLib and them call functions from it.
How should a developer import every function from the module and then call the fuctions foo and bar ?
- A. import (foo, bar) from '/path/universalContainersLib.js';
foo();
bar(); - B. import * ad lib from '/path/universalContainersLib.js';
lib.foo();
lib.bar(); - C. import all from '/path/universalContaineraLib.js';
universalContainersLib.foo();
universalContainersLib.bar(); - D. import * from '/path/universalContaineraLib.js';
universalContainersLib.foo();
universalContainersLib.bar();
Answer: B
NEW QUESTION 40
Given the code below:
01 function GameConsole (name) {
02 this.name = name;
03 }
04
05 GameConsole.prototype.load = function(gamename) {
06 console.log( ` $(this.name) is loading a game : $(gamename) ...`);
07 )
08 function Console 16 Bit (name) {
09 GameConsole.call(this, name) ;
10 }
11 Console16bit.prototype = Object.create ( GameConsole.prototype) ;
12 //insert code here
13 console.log( ` $(this.name) is loading a cartridge game : $(gamename) ...`);
14 }
15 const console16bit = new Console16bit(' SNEGeneziz ');
16 console16bit.load(' Super Nonic 3x Force ');
What should a developer insert at line 15 to output the following message using the
method ?
> SNEGeneziz is loading a cartridge game: Super Monic 3x Force . . .
- A. Console16bit.prototype.load = function(gamename) {
- B. Console16bit.prototype.load(gamename) {
- C. Console16bit.prototype.load(gamename) = function() {
- D. Console16bit = Object.create(GameConsole.prototype).load = function
(gamename) {
Answer: A
NEW QUESTION 41
developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality.
The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Given the code and the information the developer has, which code logs an error at boost with an event?
- A. Server.catch ((server) => {
console.log('ERROR', error);
}); - B. Server.error ((server) => {
console.log('ERROR', error);
}); - C. Server.on ('error', (error) => {
console.log('ERROR', error);
}); - D. Try{
server.start();
} catch(error) {
Answer: C
Explanation:
console.log('ERROR', error);
}
NEW QUESTION 42
A developer has an ErrorMandler module that contains multiple functions.
What kind of export should be leveraged so that multiple function can be used?
- A. Multi
- B. default
- C. Named
- D. All
Answer: C
NEW QUESTION 43
Refer to the following code:
What is the value of output on line 11?
- A. [1, 2]
- B. [''foo'':1, ''bar'':2'']
- C. An error will occur due to the incorrect usage of the for...of statement on line 07.
- D. [''foo'', ''bar'']
Answer: C
NEW QUESTION 44
A developer is wondering whether to use, Promise.then or Promise.catch, especially when a Promise throws an error?
Which two promises are rejected?
Which 2 are correct?
- A. New Promise(() => (throw 'cool error here'}).then(null, error => console.error(error)));
- B. New Promise((resolve, reject) => (throw 'cool error here'}).catch(error => console.error(error)) ;
- C. Promise.reject('cool error here').then(error => console.error(error));
- D. Promise.reject('cool error here').catch(error => console.error(error));
Answer: B,D
NEW QUESTION 45
Refer to the code below:
What is the value of result after line 10 executes?
- A. John Developer
- B. undefined Developer
- C. John undefined
- D. Error: myFather.job is not a function
Answer: A
NEW QUESTION 46
A developer wants to leverage a module to print a price in pretty format, and has imported a method as shown below:
Import printPrice from '/path/PricePrettyPrint.js';
Based on the code, what must be true about the printPrice function of the PricePrettyPrint module for this import to work ?
- A. printPrice must be the default export
- B. printPrice must be an all export
- C. printPrice must be a multi exportc
- D. printPrice must be be a named export
Answer: A
NEW QUESTION 47
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