CRT-600無料問題集「Salesforce Certified JavaScript Developer I」

質問 1

Refer to the code:

Given the code above, which three properties are set pet1?
Choose 3 answers:

（A）Type

（B）Name

（C）Owner

（D）canTalk

（E）Size

正解：A、D、E 解答を投票する

質問 2

The developer wants to test the array shown:
const arr = Array(5).fill(0)
Which two tests are the most accurate for this array ?
Choose 2 answers:

（A）console.assert (arr.length >0);

（B）console.assert(arr[0] === 0 && arr[ arr.length] === 0);

（C）console.assert( arr.length === 5 );

（D）arr.forEach(elem => console.assert(elem === 0)) ;

正解：C、D 解答を投票する

質問 3

A developer writes the code below to calculate the factorial of a given number function sum(number){ return number * sum(number-1);
}
sum(3);
what is the result of executing the code.

（A）-Infinity

（B）Error

（C）6

（D）0

正解：B 解答を投票する

質問 4

A developer has the following array of student test grades:
Let arr = [ 7, 8, 5, 8, 9 ];
The Teacher wants 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.mapBy (( num) => ( return num *2 )) .filterBy (( val ) => return val > 15 )) ;

（B）Let arr1 = arr.filter(( val) => ( return val > 15 )) .map (( num) => ( return num *2 ))

（C）Let arr1 = arr.map((num) => num*2). Filter (( val) => val > 15);

（D）Let arr1 = arr.map((num) => ( num *2)).filterBy((val) => ( val >15 ));

正解：C 解答を投票する

質問 5

Refer to the code below:
Const pi = 3.1415326,
What is the data type of pi?

（A）Float

（B）Double

（C）Decimal

（D）Number

正解：D 解答を投票する

質問 6

Given the code below:
Function myFunction(){
A =5;
Var b =1;
}
myFunction();
console.log(a);
console.log(b);
What is the expected output?

（A）Both lines 08 and 09 are executed, and the variables are outputted.

（B）Line 08 outputs the variable, but line 09 throws an error.

（C）Both lines 08 and 09 are executed, but values outputted are undefined.

（D）Line 08 thrones an error, therefore line 09 is never executed.

正解：B 解答を投票する

質問 7

A developer uses a parsed JSON string to work with user information as in the block below:
01 const userInformation ={
02 " id " : "user-01",
03 "email" : "[email protected]",
04 "age" : 25
Which two options access the email attribute in the object?
Choose 2 answers

（A）userInformation(email)

（B）userInformation("email")

（C）userInformation.email

（D）userInformation.get("email")

正解：B、C 解答を投票する

質問 8

Refer to the code below:
<html lang="en">
<table onclick="console.log(Table log');">
<tr id="row1">
<td>Click me!</td>
</tr>
<table>
<script>
function printMessage(event) {
console.log('Row log');
}
Let elem = document.getElementById('row1');
elem.addEventListener('click', printMessage, false);
</script>
</html>
Which code change should be made for the console to log only Row log when 'Click me! ' is clicked?

（A）Add event.stopPropagation(); to printMessage function.

（B）Add.event.stopPropagation(); to window.onLoad event handler.

（C）Add event.removeEventListener(); to window.onLoad event handler.

（D）Add event.removeEventListener(); toprintMessage function.

正解：A 解答を投票する

質問 9

Which code statement correctly retrieves and returns an object from localStorage?

（A）const retrieveFromLocalStorage = (storageKey) =>{
return window.localStorage.getItem(storageKey);
}

（B）const retrieveFromLocalStorage = () =>{
return JSON.stringify(window.localStorage.getItem(storageKey));
}

（C）const retrieveFromLocalStorage = (storageKey) =>{
return JSON.parse(window.localStorage.getItem(storageKey));
}

（D）const retrieveFromLocalStorage = (storageKey) =>{
return window.localStorage[storageKey];
}

正解：C 解答を投票する

質問 10

Refer to the code below:
Const searchTest = 'Yay! Salesforce is amazing!" ;
Let result1 = searchText.search(/sales/i);
Let result 21 = searchText.search(/sales/i);
console.log(result1);
console.log(result2);
After running this code, which result is displayed on the console?

（A）> 5 > 0

（B）> 5 >undefined

（C）> 5 > -1

（D）> true > false

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 11

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）["foo:1","bar:2"]

（B）["bar","foo"]

（C）["foo","bar"]

（D）[1,2]

正解：C 解答を投票する

質問 12

A test has a dependency on database. query. During the test, the dependency is replaced with an object called database with the method, Calculator query, that returns an array. The developer does not need to verify how many times the method has been called.
Which two test approaches describe the requirement?
Choose 2 answers

（A）Substitution

（B）Stubbing

（C）White box

（D）Black box

正解：A、C 解答を投票する

質問 13

Refer to the code below:
function foo () {
const a =2;
function bat() {
console.log(a);
}
return bar;
}
Why does the function bar have access to variable a ?

（A）Outer function's scope

（B）Hoisting

（C）Inner function's scope

（D）Prototype chain

正解：A 解答を投票する

質問 14

Cloud Kicks has a class to represent items for sale in an online store, as shown below:
Class Item{
constructor (name, price){
this.name = name;
this.price = price;
}
formattedPrice(){
return 's' + String(this.price);}}
A new business requirement comes in that requests a ClothingItem class that should have all of the properties and methods of the Item class but will also have properties that are specific to clothes.
Which line of code properly declares the clothingItem class such that it inherits from Item?

（A）Class ClothingItem extends Item {

（B）Class ClothingItem {

（C）Class ClothingItem implements Item{

（D）Class ClothingItem super Item {

正解：A 解答を投票する

CRT-600 無料問題集「Salesforce Certified JavaScript Developer I」

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