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Salesforce JavaScript-Developer-I Exam Overview:

Certification Vendor:Salesforce
Exam Name:Salesforce Certified JavaScript Developer I
Exam Number:JS-Dev-001
Exam Price:USD 200 (may vary by region/tax)
Real Exam Qty:60
Passing Score:65%
Available Languages:English
Exam Duration:105 minutes
Exam Format:Multiple Choice, Multiple Select
Certificate Validity Period:1 year (maintenance required via Salesforce certification maintenance modules)
Related Certifications:Salesforce Certified Platform App Builder
Salesforce Certified Platform Developer I
Salesforce Certified JavaScript Developer I
Recommended Training:Salesforce Trailhead JavaScript Developer I Prep
Salesforce Developer Learning Paths
Exam Registration:Salesforce Credentials Page
Salesforce Certification Registration (Webassessor)
Sample Questions:Salesforce JavaScript-Developer-I Sample Questions
Exam Way:Online proctored or onsite testing via Kryterion Webassessor
Pre Condition:No formal prerequisites, but familiarity with JavaScript and Salesforce platform development is strongly recommended.
Official Syllabus URL:https://trailhead.salesforce.com/credentials/javascriptdeveloper1

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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.

Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q38-Q43):

NEW QUESTION # 38
Value of:
true + 3 + ' 100 ' + null

Answer: D

Explanation:
The correct answer is A .
JavaScript evaluates the expression from left to right:
true + 3 + ' 100 ' + null
Step 1:
true + 3
In numeric addition, true is converted to:
1
So:
true + 3
becomes:
1 + 3
Result:
4
Step 2:
4 + ' 100 '
Because one operand is a string, JavaScript performs string concatenation instead of numeric addition.
So:
4 + ' 100 '
becomes:
" 4100 "
Step 3:
" 4100 " + null
Again, because one operand is already a string, JavaScript converts null into the string:
" null "
So the final result is:
" 4100null "
Execution summary:
true + 3 + ' 100 ' + null
// 1 + 3 + ' 100 ' + null
// 4 + ' 100 ' + null
// " 4100 " + null
// " 4100null "
Therefore, the verified answer is A .


NEW QUESTION # 39
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?

Answer: A


NEW QUESTION # 40
Refer the code below.
x=3.14;
function myfunction() {
"use strict";
y=x;
}
z=x;
myFunction();

Answer:

Explanation:
See the Answer below in explanation:
Explanation
Z is equal to 3.14
Use strict has effect only on line 5.
Line 5 throws an error


NEW QUESTION # 41
Refer to HTML below:
<div id ="main">
<div id = " card-00">This card is smaller.</div>
<div id = "card-01">The width and height of this card is determined by its
contents.</div>
</div>
Which expression outputs the screen width of the element with the ID card-01?

Answer: D


NEW QUESTION # 42
Refer to the code below:
Async funct on functionUnderTest(isOK) {
If (isOK) return 'OK' ;
Throw new Error('not OK');
)
Which assertion accuretely tests the above code?

Answer: A


NEW QUESTION # 43
......

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