JavaScript-Developer-I試験無料問題集（224題）「Salesforce Certified JavaScript Developer I 認定」

出題：1

A developer wrote a fizzbuzz function thatwhen passed in a number, returns the following:
'Fizz' if the number is divisible by 3.
'Buzz' if the number is divisible by 5.
'Fizzbuzz' if the number is divisible by both 3 and 5.
Empty string if the number is divisible by neither 3 or 5.
Whichtwo test cases will properly test scenarios for the fizzbuzz function?
Choose 2 answers

A. let res = fizzbuzz(15);console.assert ( res === ' fizzbuzz ' )

B. let res = fizzbuzz(5);console.assert ( res === ' ' );

C. let res = fizzbuzz(3);console.assert ( res === ' buzz ' )

D. let res = fizzbuzz(Infinity);console.assert ( res === ' ' )

正解：A,C,D 解答を投票する

出題：2

Refer to the following array:
Let arr = [ 1,2, 3, 4, 5];
Which three options result in x evaluating as [3, 4, 5] ?
Choose 3 answers.

A. Let x= arr.filter (( a) => (a<2));

B. Letx= arr.filter((a) => ( return a>2 ));

C. Let x= arr.slice(2);

D. Let x = arr.slice(2,3);

E. Let x= arr.splice(2,3);

正解：B,C,E 解答を投票する

出題：3

A developer is debugging a web server that uses Node.js The server hits a runtimeerror every third request to an important endpoint on the web server.
The developer added a break point to the start script, that is at index.js at he root of the server's source code. The developer wants to make use of chrome DevTools to debug.
Which command can be run to access DevTools and make sure the breakdown is hit ?

A. Node --inspect index.js

B. Node --inspect-brk index.js

C. Node inspect index.js

D. node -i index.js

正解：A 解答を投票する

出題：4

Refer to the code below:
Let inArray =[ [ 1, 2 ] , [ 3, 4, 5 ] ];
Which two statements result in the array [1, 2, 3, 4, 5] ?
Choose 2 answers

A. [ ]. concat.apply(inArray, [ ]);

B. [ ]. Concat.apply ([ ], inArray);

C. [ ]. concat ( [ ....inArray ] );

D. []. Concat (... inArray);

正解：B,D 解答を投票する

出題：5

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. 36

B. 11

C. 16

D. 25

正解：C 解答を投票する

出題：6

developer is trying to convince management that their team will benefit from using Node.js for a backend server that they are going to create. The server will be a web server that handles API requests from a website that the teamhas already built using HTML, CSS, and JavaScript.
Which three benefits of Node.js can the developer use to persuade their manager?
Choose 3 answers:

A. Installs with its own package manager to install and manage third-party libraries.

B. Performs a static analysis on code before execution to look for runtime errors.

C. Uses non-blocking functionality for performant requesthandling .

D. Ensures stabilitywith one major release every few years.

E. Executes server-side JavaScript code to avoid learning a new language.

正解：A,B,C 解答を投票する

出題：7

A developer receives a comment from the Tech Lead that the code given below has error:
const monthName = 'July';
const year = 2019;
if(year === 2019) {
monthName ='June';
}
Which line edit should be made to make this code run?

A. 03 if (year == 2019) {

B. 02 const year = 2020;

C. 02 let year =2019;

D. 01 let monthName ='July';

正解：D 解答を投票する

出題：8

Refer to the code below:
Function changeValue(obj) {
Obj.value = obj.value/2;
}
Const objA = (value: 10);
Const objB = objA;
changeValue(objB);
Const result = objA.value;
What is the value of result after the code executes?

A. Undefined

B. 5

C. Nan

D. 10

正解：B 解答を投票する

出題：9

Referto the following code:

Which two statement could be inserted at line 17 to enable the function call on line 18?
Choose 2 answers

A. leo.roar = () => { console.log('They\'re pretty good!'); );

B. Object.assign (leo. Tiger);

C. Object.assign (leo, tony);

D. leo.prototype.roar = ( ) =>( console.log('They\'re pretty good!'); };

正解：A,C 解答を投票する

出題：10

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

A. const addBy = function(num1){
return num1 + num2;
}

B. const addBY = (num1) => (num2) => num1 + num2;

C. const addBy = function(num1){
return function(num2){
return num1 + num2;
}

D. const addBy = (num1) => num1 + num2 ;

正解：B,C 解答を投票する

出題：11

Refer tothe code below:

What is the value of result after line 10 executes?

A. John Developer

B. John undefined

C. undefined Developer

D. Error: myFather.job is not a function

正解：A 解答を投票する

出題：12

developer publishes a new version of a package with new features that do not break backward compatibility. The previous version number was 1.1.3.
Following semantic versioning format, what should the new package version number be?

A. 1.2.0

B. 2.0.0

C. 1.1.4

D. 1.2.3

正解：B 解答を投票する

JavaScript-Developer-I試験無料問題集「Salesforce Certified JavaScript Developer I 認定」