Salesforce JavaScript Developer I Practice
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Salesforce Certified JavaScript Developer I
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1.A developer uses a parsed JSON string to work with user information as in the block below:
01 const userInformation ={
02 “ id ”: “user-01”,
03 “email”: “user01@universalcontainers.demo”,
04 “age”: 25
Which two options access the email attribute in the object? Choose 2 answers
A. userInformation(“email”)
B. userInformation.get(“email”)
C. userInformation.email
D. userInformation(email)
Answer: A,C
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2.Refer to the code below:
01 const server = require(‘server’);
02 /* Insert code here */
A developer imports a library that creates a web server. The imported library uses events and
callbacks to start the servers
Which code should be inserted at the line 03 to set up an event and start the web server?
A. Server.start ();
B. server.on(‘ connect ’, (port) => {console.log(‘Listening on ’, port) ;})
C. server()
D. serve(( port) => (
E. console.log( ‘Listening on ’, port) ;
Answer: B
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3.Whichthree actions can be using the JavaScript browser console? Choose 3 answers:
A. View and change DOM the page.
B. Display a report showing the performance of a page.
C. Run code that is not related to page.
D. view, change, and debug the JavaScript code of the page.
E. View and change security cookies.
Answer: A,C,D
4.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. The z variable is assigned the correct object.
B. The z variable is assigned the correct object but this.name remains undefined.
C. Window.name is assigned to ‘hello’ and the variable z remains undefined.
D. Window.m is assigned the correct object.
Answer: C
5.A class was written to represent items for purchase in an online store, and a second class.
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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 ScarfUncaught TypeError: saleItem.description is not a functionThis is aScarfThis is a
discounted Shirt
B. This is a ScarfThis is a ShirtThis is a ScarfThis is a discounted Shirt
C. This is a ScarfThis is a ShirtThis is a discounted ScarfThis is a discounted Shirt
D. This is aScarfUncaught TypeError: saleItem.description is not a functionThis is a ShirtThis is a did
counted Shirt
Answer: B
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6.A developer writers the code below to calculate the factorial of a given number.
Function factorial(number) {
Return number + factorial(number -1);
}
factorial(3);
What is the resultof executing line 04?
A. 0
B. 6
C. -Infinity
D. RuntimeError
Answer: D
7.Refer to the code below:
Const pi = 3.1415326,
What is the data type of pi?
A. Double
B. Number
C. Decimal
D. Float
Answer: B
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8.Given the code below:
01 function GameConsole (name) {
02 this.name = name;
3}
4
5 GameConsole.prototype.load = function(gamename) {
6 console.log (` $(this.name) is loading agame: $(gamename) …`);
7)
8 function Console 16 Bit (name) {
9 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 cartridgegame: Super Monic 3x Force . . .
A. Console16bit.prototype.load(gamename) = function() {
B. Console16bit.prototype.load = function(gamename) {
C. Console16bit = Object.create(GameConsole.prototype).load = function(gamename) {
D. Console16bit.prototype.load(gamename) {
Answer: B
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9.Refer to the following array:
Let arr1 = [ 1,2, 3, 4, 5 ];
Which two lines of code result in a second array, arr2 being created such that arr2 is not a reference
to arr1?
A. Let arr2 = arr1.slice(0, 5);
B. Let arr2 = Array.from(arr1);
C. Let arr2 = arr1;
D. Let arr2 = arr1.sort();
Answer: A,B
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10.A developer creates an object where its properties should be immutable and prevent properties
from being added or modified.
Which method should be used to execute this business requirement?
A. Object.const()
B. Object.eval()
C. Object.lock()
D. Object.freeze()
Answer: D
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11.Given two expressions var1 and var2.
What are two valid ways to return the logical AND of the two expressions and ensure it is data type
Boolean? Choose 2 answers:
A. Boolean(var1 && var2)
B. var1 && var2
C. var1.toBoolean() && var2toBoolean()
D. Boolean(var1) && Boolean(var2)
Answer: A,D
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Q
12.GIven a value, which three options can a developer use to detect if thevalue is NaN? Choose 3
answers
A. value == NaN
B. Object.is(value, NaN)
C. value === Number.NaN
D. value ! == value
E. Number.isNaN(value)
Answer: A,E
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13.Given the code below:
const delay = sync delay => {
Return new Promise ((resolve, reject) => {
setTimeout (resolve,delay);});};
const callDelay =async () => {
const yup =await delay (1000);
console.log (1);
What is logged to the console?
A.123
B.132
C.213
D.231
Answer: D