JS-Dev-101無料問題集「Salesforce Certified JavaScript Developer

質問 1

for (let number = 2; number <= 5; number += 1) {
// faster code statement here
}
Which statement meets the requirements to log an error when the Boolean statement evaluates to false?

（A）console.classy(number + 2 === 0);

（B）assert(number + 2 === 0);

（C）console.error(number + 2 === 0);

（D）console.assert(number + 2 === 0);

正解：D 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 2

Refer to the following object:
const dog = {
firstName: 'Beau',
lastName: 'Boo',
get fullName() {
return this.firstName + ' ' + this.lastName;
}
};
How can a developer access the fullName property for dog?

（A）dog.get.fullName

（B）dog.fullName()

（C）dog.fullName

（D）dog.function.fullName()

正解：C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 3

Corrected code:
let obj = {
foo: 1,
bar: 2
};
let output = [];
for (let something in obj) {
output.push(something);
}
console.log(output);
What is the output of line 11?

（A）[1, 2]

（B）["foo", "bar"]

（C）["bar", "foo"]

（D）["foo:1", "bar:2"]

正解：B 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 4

Refer to the following code block:
01 let array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];
02 let output = 0;
03
04 for (let num of array) {
05 if (output > 10) {
06 break;
07 }
08 if (num % 2 == 0) {
09 continue;
10 }
11 output += num;
12 }
What is the value of output after the code executes?

（A）16

（B）11

（C）25

（D）36

正解：A 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 5

A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array. The test passes:
01 let res = sum3([1, 2, 3]);
02 console.assert(res === 6);
03
04 res = sum3([1, 2, 3, 4]);
05 console.assert(res === 6);
A different developer made changes to the behavior of sum3 to instead sum all of the numbers present in the array.
Which two results occur when running the test on the updated sum3 function?

（A）The line 02 assertion fails.

（B）The line 05 assertion fails.

（C）The line 02 assertion passes.

（D）The line 05 assertion passes.

正解：B、C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 6

Which three actions can the code execute in the browser console?

（A）Display a report showing the performance of a page.

（B）Run code that is not related to the page.

（C）View and change the DOM of the page.

（D）View, change, and debug the JavaScript code of the page.

（E）View and change security cookies.

正解：B、C、D 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 7

const str = 'Salesforce';
Which two statements result in the word "Sales"?

（A）str.substr(s, 5);

（B）str.substr(0, 5);

（C）str.substring(0, 5);

（D）str.substring(0, 5);

正解：B、C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 8

Refer to the code below:
01 function myFunction(reassign) {
02 let x = 1;
03 var y = 1;
04
05 if (reassign) {
06 let x = 2;
07 var y = 2;
08 console.log(x);
09 console.log(y);
10 }
11
12 console.log(x);
13 console.log(y);
14 }
What is displayed when myFunction(true) is called?

（A）2 2 undefined undefined

（B）2 2 1 2

（C）2 2 1 1

（D）2 2 2 2

正解：B 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 9

Which statement accurately describes the behavior of the async/await keywords?

（A）The associated class contains some asynchronous functions.

（B）The associated function can only be called via asynchronous methods.

（C）The associated function is asynchronous, but acts like synchronous code.

（D）The associated function sometimes returns a promise.

正解：C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 10

Refer to the code below:
01 const objBook = {
02 title: 'JavaScript',
03 };
04 Object.preventExtensions(objBook);
05 const newObjBook = objBook;
06 newObjBook.author = 'Robert';
What are the values of objBook and newObjBook respectively?

（A）{ author: "Robert" }
{ author: "Robert", title: "JavaScript" }

（B）{ author: "Robert", title: "JavaScript" }
{ author: "Robert", title: "JavaScript" }

（C）{ title: "JavaScript" }
{ title: "JavaScript" }

（D）{ author: "Robert", title: "JavaScript" }
undefined

正解：C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

JS-Dev-101 無料問題集「Salesforce Certified JavaScript Developer - Multiple Choice」

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