Salesforce CRT-600 問題集

質問 1：
Given the expressions var1 and var2, what are two valid ways to return the concatenation of the two expressions and ensure it is string? Choose 2 answers
A. String (var1) .concat (var2)
B. var1.toString ( ) var2.toString ( )
C. var1 + var2
D. string.concat (var1 +var2)
正解：B,D

質問 2：
developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality.
The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Given the code and the information the developer has, which code logs an error at boost with an event?
A. Server.catch ((server) => {
console.log('ERROR', error);
});
B. Try{
server.start();
} catch(error) {
C. Server.error ((server) => {
console.log('ERROR', error);
});
D. Server.on ('error', (error) => {
console.log('ERROR', error);
});
正解：D
解説: (Topexam メンバーにのみ表示されます)

質問 3：
Considering the implications of 'use strict' on line 04, which three statements describe the execution of the code?
Choose 3 answers
A. 'use strict' is hoisted, so it has an effect on all lines.
B. Line 05 throws an error.
C. z is equal to 3.14.
D. 'use strict' has an effect only on line 05.
E. 'use strict' has an effect between line 04 and the end of the file.
正解：B,C,D

質問 4：
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?

A)

B)

C)

D)

A. Option A
B. Option C
C. Option D
D. Option B
正解：A

質問 5：
Considering type coercion, what does the following expression evaluate to?
True + '13' + NaN
A. ' 113Nan '
B. ' true13 '
C. 14
D. ' true13NaN '
正解：D

質問 6：
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. Use the document object instead of the window object.
B. Create a new window object in the root file.
C. Assign variables to the global object.
D. Assign variables to module.exports and require them as needed.
正解：C