Updated Salesforce JavaScript-Developer-I Practice Questions in PDF Format

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Salesforce JavaScript-Developer-I Exam is a multiple-choice exam that consists of 60 questions. The time limit for the exam is 105 minutes, and candidates must score at least 68% to pass. JavaScript-Developer-I exam is available in English, Japanese, and Spanish, and it is proctored online.

Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q49-Q54):

NEW QUESTION # 49
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?

Answer: D

NEW QUESTION # 50
A developer implements and calls the following code when an application state change occurs:

If the back button is clicked after this method is executed, what can a developer expect?

A. The page reloads and all JavaScript is reinitialized.
B. The page is navigated away from and previous page in the browser's history is loaded.
C. A navigate event is fired with a state properly that details previous application state.
D. A popstate event is fired with a state properly that details the application's last state.

Answer: B

NEW QUESTION # 51
Refer to the following array:
let arr = [1, 2, 3, 4, 5];
Which two lines of code result in a second array, arr2, created such that arr2 is a reference to arr?

A. let arr2 = Array.from(arr);
B. let arr2 = arr;
C. let arr2 = arr.sort();
D. let arr2 = arr.slice(0, 5);

Answer: B,C

Explanation:
The correct answers are C and D .
Arrays in JavaScript are objects. When an array variable is assigned directly to another variable, both variables point to the same array in memory.
Option C is correct:
let arr2 = arr;
This does not create a new array. It creates another reference to the same array.
Example:
arr2.push(6);
console.log(arr);
Output:
[1, 2, 3, 4, 5, 6]
Changing arr2 also affects arr because both variables reference the same array.
Option D is also correct:
let arr2 = arr.sort();
The sort() method sorts the array in place and returns the same array reference. Therefore, arr2 refers to the same array object as arr.
The incorrect options create copies:
let arr2 = arr.slice(0, 5);
creates a shallow copy.
let arr2 = Array.from(arr);
also creates a new shallow copy.
So the two lines that make arr2 reference the original arr are C and D .

NEW QUESTION # 52
What are two unique features of functions defined with a fat arrow as compared to normal function definition?
Choose 2 answers

A. The function receives an argument that is always in scope, called parentThis, which is the enclosing lexical scope.
B. If the function has a single expression in the function body, the expression will be evaluated and implicit returned.
C. The function generated its own this making it useful for separating the function's scope from its enclosing scope.
D. The function uses the this from the enclosing scope.

Answer: B,C

NEW QUESTION # 53
Refer to the code below:

In which sequence will the number be logged?

A. 1 3 0 2 4
B. 0 2 4 3 1
C. 0 1 2 3 4
D. 0 2 4 1 3

Answer: B

NEW QUESTION # 54
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