Salesforce javascript developer i practice test
Certified JavaScript Developer I
Last exam update: Dec 15 ,2024
Question 1
A developer is trying to handle an error within a function.
Which code segment shows the correct approach to handle an error without propagating it
elsewhere?
A)
B)
C)
D)
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Answer:
D
Question 2
Which two options are core Node.js modules?
Choose 2 answers
- A. worker
- B. isotream
- C. exception
- D. http
Answer:
B, D
Question 3
Refer to the code below:
What is the value of result after line 10 executes?
- A. Error: myFather.job is not a function
- B. John Developer
- C. undefined Developer
- D. John undefined
Answer:
B
Question 4
Refer to the code below:
Which value can a developer expect when referencing country,capital,cityString?
- A. 'London'
- B. undefined
- C. An error
- D. 'NaN'
Answer:
D
Question 5
Given the code below:
Which method can be used to provide a visual representation of the list of users and to allow sorting
by the name or email attribute?
- A. console.group(usersList) ;
- B. console.table(usersList) ;
- C. console.info(usersList) ;
- D. console.groupCol lapsed (usersList) ;
Answer:
A
Question 6
Refer to the code below:
Considering that JavaScript is single-threaded, what is the output of line 08 after the code executes?
- A. 10
- B. 11
- C. 12
- D. 13
Answer:
B
Question 7
Refer to the following code block:
What is the console output?
- A. > Better student Jackie got 70% on test.
- B. > Jackie got 70% on test.
- C. > Uncaught Reference Error
- D. > Better student Jackie got 100% on test.
Answer:
A
Question 8
Which statement can a developer apply to increment the browser's navigation history without a
page refresh?
Which statement can a developer apply to increment the browser's navigation history without a
page refresh?
- A. window.history.pushState(newStateObject);
- B. window.history.pushStare(newStateObject, ' ', null);
- C. window.history.replaceState(newStateObject,' ', null);
- D. window.history.state.push(newStateObject);
Answer:
C
Question 9
Considering the implications of 'use strict' on line 04, which three statements describe the execution
of the code?
Choose 3 answers
- A. z is equal to 3.14.
- B. 'use strict' is hoisted, so it has an effect on all lines.
- C. 'use strict' has an effect only on line 05.
- D. 'use strict' has an effect between line 04 and the end of the file.
- E. Line 05 throws an error.
Answer:
A, C, E
Question 10
Refer to the following code:
What is the output of line 11?
- A. [1,2]
- B. ["bar", "foo"]
- C. ["foo:1", "bar:2"]
- D. ["foo", "bar"]
Answer:
D
Question 11
myArraym can have one level, two levels, or more levels.
Which statement flattens myArray when it can be arbitrarily nested?
- A. myArray. reduce ((prev, curr) => prev.concat(curr) [ ]);
- B. myArray. join (","). split (",");
- C. [ ] .concat {. . .myArray) ;
- D. myArray.flat(Infinity);
Answer:
A
Question 12
A developer writes the code below to return a message to a user attempting to register a new
username. If the username is available, a variable named nag is declared and assigned a value on line
03.
What is the value of msg when getAvailableabilityMessage (newUserName) is executed and get
Availability (newUserName) returns true?
- A. "msg is not defined"
- B. "newUserName"
- C. "User-name available"
- D. undefined
Answer:
C
Question 13
Refer of the string below:
Const str = sa;esforce=;
Which two statement result in the word 'Sale'?
Choose 2 answers
- A. str, substring (0,5) ;
- B. str, substr(0,5) ;
- C. str, substring(1,5) ;
- D. str, substr(1,5) ;
Answer:
A, B
Question 14
developer uses the code below to format a date.
After executing, what is the value of formattedDate?
- A. May 10, 2020
- B. June 10, 2020
- C. October 05, 2020
- D. November 05, 2020
Answer:
A
Question 15
Refer to the code below:
What is the value of result when the code executes?
- A. 10-10
- B. 5-5
- C. 10-5
- D. 5-10
Answer:
A