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Salesforce Certified JavaScript Developer I exam is a multiple-choice exam that consists of 60 questions. The time allotted for JavaScript-Developer-I exam is 105 minutes, and a passing score of 68% is required. JavaScript-Developer-I exam fee is $200, and it can be taken online or at a testing center.

The Salesforce JavaScript-Developer-I exam consists of 60 multiple-choice questions that are designed to test your knowledge of JavaScript concepts, as well as your ability to apply those concepts in a Salesforce environment. JavaScript-Developer-I Exam is timed and you will have 105 minutes to complete it. To pass the exam, you will need to score at least 68% or higher.

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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 (Q50-Q55):

NEW QUESTION # 50
A test has a dependency on database .query. During the test the dependency is replace with an called database with the method, query, that returns an array. The developer needs to verify how many times the method was called and the arguments used each time.
Which two test approaches describe the requirement?

A. Black box
B. Integration
C. White box
D. Mocking

Answer: B,C

NEW QUESTION # 51
Refer to the code below:

Line 05 causes an error.
What are the values of greeting and salutation once code completes?

A. Greeting is Hello and salutation is Hello, Hello.
B. Greeting is Hello and salutation is I say hello.
C. Greeting is Goodbye and salutation is I say Hello.
D. Greeting is Goodbye and salutation is Hello, Hello.

Answer: A

NEW QUESTION # 52
JavaScript:
01 function Tiger() {
02 this.type = ' Cat ' ;
03 this.size = ' large ' ;
04 }
05
06 let tony = new Tiger();
07 tony.roar = () = > {
08 console.log( ' They\ ' re great! ' );
09 };
10
11 function Lion() {
12 this.type = ' Cat ' ;
13 this.size = ' large ' ;
14 }
15
16 let leo = new Lion();
17 // Insert code here
18 leo.roar();
Which two statements could be inserted at line 17 to enable line 18?

A. leo.roar = () = > { console.log( ' They\ ' re pretty good! ' ); };
B. leo.prototype.roar = () = > { console.log( ' They\ ' re pretty good! ' ); };
C. Object.assign(leo, tony);
D. Object.assign(leo, Tiger);

Answer: A,C

Explanation:
There are two valid ways to ensure leo.roar() exists:
* Directly assign a roar function to leo (Option A). Assigning a property to an instance object creates a new method on that instance.
* leo.roar = () = > { console.log( ' They\ ' re pretty good! ' ); };
After this, calling leo.roar() is valid.
* Copy tony's properties into leo using Object.assign (Option B). Object.assign(target, source) copies enumerable own properties from the source object into the target object. Since tony.roar exists, executing:
* Object.assign(leo, tony);
copies roar into leo, making leo.roar() valid.
Why the other answers are incorrect:
* Option C: Object.assign(leo, Tiger) copies properties from the function object Tiger , not from Tiger.
prototype and not from a Tiger instance. Tiger (the function) has no roar property, so nothing useful is copied.
* Option D: leo.prototype is undefined because leo is an instance, not a constructor function. Only constructor functions have a .prototype property. This line would cause an error.
JavaScript Knowledge References (text-only)
* Instances have their own properties and do not contain a .prototype property.
* Object.assign(target, source) copies own enumerable properties of the source object.
* Assigning a function as a property of an object creates a callable method.

NEW QUESTION # 53
Refer to the following array:
Let arr1 = [1, 2, 3, 4, 5];
Which two lines of codes result in a second array, arr2, being created such that arr2 is not a reference to arr1? Choose 2 answers

A. Let arr2 = arr1;
B. Let arr2 = arr1 .slice (0, 5);
C. Let arr2 = Array. From (arr1) ;
D. Let arr2 = arr1 sort ();

Answer: A,D

NEW QUESTION # 54
A team that works on a big project uses npm to deal with projects dependencies.
A developer added a dependency does not get downloaded when they execute npm install.
Which two reasons could be possible explanations for this?
Choose 2 answers

A. The developer missed the option --save when adding the dependency.
B. The developer added the dependency as a dev dependency, and
NODE_ENV is set to production.
C. The developer missed the option --add when adding the dependency.
D. The developer added the dependency as a dev dependency, and
NODE_ENV
Is set to production.

Answer: A,B,D

NEW QUESTION # 55
......

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