Enhance Your Skills with Free Salesforce Certified JavaScript Developer I Practice Questions

Question 1

Given the JavaScript below:

Which code should replace the placeholder comment on line 06 to hide accounts that do not match the search string?

A'None' : 'block'

B'Visible : 'hidden'

C'Hidden, visible

D'Block' : 'none'

Correct : D

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A'None' : 'block'

B'Visible : 'hidden'

C'Hidden, visible

D'Block' : 'none'

Question 2

A developer wants to use a module called DataPrettyPrint. This module exports one default functioncalled printDate ().

How can a developer import and use the printDate() function?

AOption A

BOption B

COption C

DOption D

Correct : B

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AOption A

BOption B

COption C

DOption D

Question 3

The developer wants to test this code:

Const toNumber =(strOrNum) => strOrNum;

Which two tests are most accurate for this code?

Choose 2 answers

Aconsole.assert(toNumber('2') === 2);

Bconsole.assert(Number.isNaN(toNumber()));

Cconsole.assert(toNumber('-3') < 0);

Dconsole.assert(toNumber () === NaN);

Correct : A, C

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Aconsole.assert(toNumber('2') === 2);

Bconsole.assert(Number.isNaN(toNumber()));

Cconsole.assert(toNumber('-3') < 0);

Dconsole.assert(toNumber () === NaN);

Question 4

Which javascript methods can be used to serialize an object into a string and deserialize

a JSON string into an object, respectively?

AJSON.stringify and JSON.parse

BJSON.serialize and JSON.deserialize

CJSON.encode and JSON.decode

DJSON.parse and JSON.deserialize

Correct : A

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AJSON.stringify and JSON.parse

BJSON.serialize and JSON.deserialize

CJSON.encode and JSON.decode

DJSON.parse and JSON.deserialize

Question 5

Refer to the code below:

const addBy = ?

const addByEight =addBy(8);

const sum = addBYEight(50);

Which two functions can replace line 01 and return 58 to sum?

Choose 2 answers

Aconst addBy = function(num1){
return function(num2){
return num1 + num2;
}

Bconst addBy = function(num1){
return num1 + num2;
}

Cconst addBy = (num1) => num1 + num2 ;

Dconst addBY = (num1) => (num2) => num1 + num2;

Correct : A, D

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Aconst addBy = function(num1){
return function(num2){
return num1 + num2;
}

Bconst addBy = function(num1){
return num1 + num2;
}

Cconst addBy = (num1) => num1 + num2 ;

Dconst addBY = (num1) => (num2) => num1 + num2;

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