CRT-600試験無料問題集（225題）「Salesforce Certified JavaScript Developer I 認定」

出題：1

In the browser, the window object is often used to assign variables that require the broadest scope in an application Node.js application does not have access to the window object by default.
Which two methods are used to address this ?
Choose 2 answers

A. Create a new window object in the root file.

B. Use the document object instead of the window object.

C. Assign variables to module.exports and require them as needed.

D. Assign variables to the global object.

正解：D 解答を投票する

出題：2

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. Error

B. -Infinity

C. 6

D. 0

正解：A 解答を投票する

出題：3

Refer to the following code that performs a basic mathematical operation on a provided input:
function calculate(num) {
Return (num +10) / 3;
}
How should line 02 be written to ensure that x evaluates to 6 in the line below?
Let x = calculate (8);

A. Return Number((num +10) /3 );

B. Return Number(num + 10) / 3;

C. Return Integer(num +10) /3;

D. Return (Number (num +10 ) / 3;

正解：D 解答を投票する

出題：4

Refer to the following code:
<html lang="en">
<body>
<div onclick = "console.log('Outer message') ;">
<button id ="myButton">CLick me<button>
</div>
</body>
<script>
function displayMessage(ev) {
ev.stopPropagation();
console.log('Inner message.');
}
const elem = document.getElementById('myButton');
elem.addEventListener('click' , displayMessage);
</script>
</html>
What will the console show when the button is clicked?

A. Inner message
Outer message

B. Outer message

C. Outer message
Inner message

D. Inner message

正解：D 解答を投票する

出題：5

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.removeEventListener(); toprintMessage function.

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

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

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

正解：C 解答を投票する

出題：6

Which code change should be done for the console to log the following when 'Click me!' is clicked'
> Row log
> Table log

A. Change line 10 to event.stopPropagation (false) ;

B. Change line 14 to elem.addEventListener ('click', printMessage, true);

C. Remove line 10

D. Remove lines 13 and 14

正解：A 解答を投票する

出題：7

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 number in the array, The test passes:
Let res = sum2([1, 2, 3 ]) ;
console.assert(res === 6 );
Res = sum3([ 1, 2, 3, 4]);
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. The test passes:
Which two results occur when running the test on the updated sum3 function ?
Choose 2 answers

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

出題：8

Which statement accurately describes the behaviour of the async/ await keyworks ?

A. The associated class contains some asynchronous functions.

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

C. The associated sometimes returns a promise.

D. The associated function will always return a promise

正解：D 解答を投票する

出題：9

GIven a value, which three options can a developer use to detect if the value is NaN?
Choose 3 answers !

A. value == NaN

B. value ! == value

C. value === Number.NaN

D. Number.isNaN(value)

E. Object.is(value, NaN)

正解：A,D 解答を投票する

出題：10

A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
* Will establish a web socket connection and handle receipt of messages to the server
* Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?

A. ws.connect (( ) => {
console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }};

B. try{
ws.connect (( ) => {
console.log('connected to client'); });

C. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};

D. ws.on ('connect', ( ) => {
console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' , error); });
});

正解：C 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：11

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：12

A developer implements and calls the following code when an application state change occurs:
Const onStateChange =innerPageState) => {
window.history.pushState(newPageState, ' ', null);
}
If the back button is clicked after this method is executed, what can a developer expect?

A. The page is navigated away from and the previous page in the browser's history is loaded.

B. A navigate event is fired with a state property that details the previous application state.

C. The page reloads and all Javascript is reinitialized.

D. A popstate event is fired with a state property that details the application's last state.

正解：A 解答を投票する

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