Free Access Salesforce.JavaScript-Developer-I.v2022-12-09.q166 Practice Test (Page 29)

Question 136

Considering type coercion, What does the following expression evaluate to?
True + ) + '100 ' + null

A.104

B.'3100null'

C.'4100null'

D.4100

Question 137

Which statement phrases successfully?

A.JSON.parse( " ' foo ' " );

B.JSON.parse ( ' foo ' );

C.JSON.parse(' " foo " ');

D.JSON.parse ( " foo " );

Question 138

Which two console logs output NaN?
Choose 2 answers | |

A.console.log(10 / Number('5) ) ;

B.console.log(10 / 0);

C.console.log(parseInt ' ("two')) ;

D.console.loeg(10 / 'five');

Question 139

Which statement accurately describes an aspect of promises?

A..then ( ) manipulates and returns the original promise.

B..Them ( ) cannot be added after a catch.

C.Agruments for the callback function passed to .then ( ) are optional.

D.In a , them ( ) function, returning results is not necessary since callback will catch the result of a previous promise.

Question 140

A developer has the following array of student test grades:
Let arr - [7, 8, 5, 9]
How should want 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?

A.Let arr1 = arr .filter ((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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