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Guide for Salesforce Javascript Developer I Certification

Quiz Salesforce Javascript Developer I Certification

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/ 10

Quiz

1/10
A developer is creating a simple webpage with a button. The developer wants a message to be displayed only on the first click of the button, and subsequent clicks should not show the message. The following JavaScript code is used:
const button = document.getElementById('myButton');
function listen(event) {
alert('Hey! I am John Doe');
// What code should be added here?
}
button.addEventListener('click', listen);
Select the answer
2 correct answers
A.
Insert a check using if(event.first) to test for the first click.
B.
On line 04, add event.stopPropagation().
C.
On line 04, add button.removeEventListener('click', listen);
D.
On line 06, use an options object { once: true } with addEventListener().

Quiz

2/10
Refer to the code below:
01 const exec = (item, delay) =>{
02 new Promise(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
Select the answer
2 correct answers
A.
Async runParallel () .then(data);
B.
runParallel ( ). done(function(data){
return data;
});
C.
runParallel () .then(data);
D.
runParallel () .then(function(data)
return data

Quiz

3/10
A developer needs to test this function:
01 const sum3 = (arr) => (
02 if (!arr.length) return 0,
03 if (arr.length === 1) return arr[0],
04 if (arr.length === 2) return arr[0] + arr[1],
05 return arr[0] + arr[1] + arr[2],
06 );
Which two assert statements are valid tests for the function?




Choose 2 answers
Select the answer
2 correct answers
A.
console.assert(sum3(1, ‘2’)) == 12);
B.
console.assert(sum3(0)) == 0);
C.
console.assert(sum3(-3, 2 )) == -1);
D.
console.assert(sum3(‘hello’, 2, 3, 4)) === NaN);

Quiz

4/10
Which statement phrases successfully?
Select the answer
1 correct answer
A.
JSON.parse ( ‘ foo ’ );
B.
JSON.parse ( “ foo ” );
C.
JSON.parse( “ ‘ foo ’ ” );
D.
JSON.parse(‘ “ foo ” ’);

Quiz

5/10
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 2
completed”));
04 let car3 = new Promise(resolve => setTimeout (resolve, 3000, “Car 3
Completed”));
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?
Select the answer
1 correct answer
A.
Car 3 completed the race.
B.
Car 1 crashed in the race.
C.
Car 2 completed the race.
D.
Race is cancelled.

Quiz

6/10
Refer to the code below:
for(let number =2 ; number <= 5 ; number += 1 ) {
// insert code statement here
}
The developer needs to insert a code statement in the location shown. The code
statement has these requirements:
1. Does require an import
2. Logs an error when the boolean statement evaluates to false
3. Works in both the browser and Node.js
Which meet the requirements?
Select the answer
1 correct answer
A.
assert (number % 2 === 0);
B.
console.error(number % 2 === 0);
C.
console.debug(number % 2 === 0);
D.
console.assert(number % 2 === 0);

Quiz

7/10
A developer is working on an ecommerce website where the delivery date is dynamically
calculated based on the current day. The code line below is responsible for this calculation.
Const deliveryDate = new Date ();
Due to changes in the business requirements, the delivery date must now be today’s
date + 9 days.
Which code meets this new requirement?
Select the answer
1 correct answer
A.
deliveryDate.setDate(( new Date ( )).getDate () +9);
B.
deliveryDate.setDate( Date.current () + 9);
C.
deliveryDate.date = new Date(+9) ;
D.
deliveryDate.date = Date.current () + 9;

Quiz

8/10
Which three statements are true about promises ?
Choose 3 answers
Select the answer
3 correct answers
A.
The executor of a new Promise runs automatically.
B.
A Promise has a .then() method.
C.
A fulfilled or rejected promise will not change states .
D.
A settled promise can become resolved.
E.
A pending promise can become fulfilled, settled, or rejected.

Quiz

9/10
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 . . .
Select the answer
1 correct answer
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) {

Quiz

10/10
A developer has the following array of student test grades:
Let arr = [ 7, 8, 5, 8, 9 ];
The Teacher wants to double each score and then see an array of the students
who scored more than 15 points.
How should the developer implement the request?
Select the answer
1 correct answer
A.
Let arr1 = arr.filter(( val) => ( return val > 15 )) .map (( num) => ( return num *2 ))
B.
Let arr1 = arr.mapBy (( num) => ( return num *2 )) .filterBy (( val ) => return val > 15 )) ;
C.
Let arr1 = arr.map((num) => num*2). Filter (( val) => val > 15);
D.
Let arr1 = arr.map((num) => ( num *2)).filterBy((val) => ( val >15 ));
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Info quiz:

  • Quiz name:Salesforce Javascript Developer I Certification
  • Total number of questions:223
  • Number of questions for the test:50
  • Pass score:80%

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