Salesforce Salesforce Certifications JAVASCRIPT-DEVELOPER-I Questions & Answers

• Question 131:

  A developer has an ErrorHandler module that contains multiple functions. What kind of export should be leveraged so that multiple functions can be used?

  A. all

  B. named

  C. multi

  D. default

  Correct Answer: B

• Question 132:

  Which function should a developer use to repeatedly execute code at a fixed interval ?

  A. setIntervel

  B. setTimeout

  C. setPeriod

  D. setInteria

  Correct Answer: A

• Question 133:

  Refer to the code below:

  

  Which value can a developer expect when referencing country,capital,cityString?

  A. 'London'

  B. undefined

  C. An error

  D. 'NaN'

  Correct Answer: D

• Question 134:

  Universal Container(UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions that cause this problem. To verify this, the developer decides to do everything and log the time each

  of these three suspicious functions consumes.

  console.time(`Performance');

  maybeAHeavyFunction();

  thisCouldTakeTooLong();

  orMaybeThisOne();

  console.endTime(`Performance');

  Which function can the developer use to obtain the time spent by every one of the three functions?

  A. console.timeLog()

  B. console.getTime()

  C. console.trace()

  D. console.timeStamp()

  Correct Answer: A

• Question 135:

  Refer to the following code:

  Let obj ={

  Foo: 1,

  Bar: 2

  }

  Let output=[],

  for(let something in obj{

  output.push(something);

  }

  console.log(output);

  What is the output line 11?

  A. [1,2]

  B. ["bar","foo"]

  C. ["foo","bar"]

  D. ["foo:1","bar:2"]

  Correct Answer: C

• Question 136:

  Refer to following code block:

  Let array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,];

  Let output =0;

  For (let num of array){

  if (output >0){

  Break;

  }

  if(num % 2 == 0){

  Continue;

  }

  Output +=num;

  What is the value of output after the code executes?

  A. 16

  B. 36

  C. 11

  D. 25

  Correct Answer: A

• Question 137:

  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 tolack 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.mis assigned the correct object.

  Correct Answer: C

• Question 138:

  Refer to the code below:

  const event = new CustomEvent(

  //Missing Code

  );

  obj.dispatchEvent(event);

  A developer needs to dispatch a custom event called update to send information about recordId.

  Which two options could a developer insert at the placeholder in line 02 to achieve this?

  Choose 2 answers

  A. `Update' , ( recordId : `123abc' (

  B. `Update' , `123abc'

  C. { type : `update', recordId : `123abc' }

  D. `Update' , { Details : { recordId : `123abc' } }

  Correct Answer: AD

• Question 139:

  Why would a developerspecify a package.jason as a developed forge instead of a dependency?

  A. It is required by the application in production.

  B. It is only needed for local development and testing.

  C. Other required packages depend on it for development.

  D. It should be bundled when the package is published.

  Correct Answer: B

• Question 140:

  A team that works on a big project uses npm to deal with projects dependencies.

  A developer added a dependency does not get downloaded when they executenpminstall.

  Which two reasons could be possible explanations for this?

  Choose 2 answers

  A. The developer missed the option --add when adding the dependency.

  B. The developer added the dependency as a dev dependency, and NODE_ENV Is set to production.

  C. The developer missed the option --save when adding the dependency.

  D. The developer added the dependency as a dev dependency, and NODE_ENV is set to production.

  Correct Answer: BCD