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The Salesforce JavaScript-Developer-I exam covers a wide range of topics, including the fundamentals of JavaScript, the use of JavaScript in the Salesforce platform, and best practices for developing and testing JavaScript code. It also evaluates the candidate's understanding of the Salesforce platform, including its architecture, security and data model, and its integration with other technologies. Passing the Salesforce JavaScript-Developer-I Exam demonstrates that the candidate has a deep understanding of JavaScript and its application in the Salesforce platform, and is capable of developing high-quality, scalable, and efficient custom applications in Salesforce.

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Salesforce JavaScript-Developer-I is a certification exam designed for professionals who want to demonstrate their expertise in using JavaScript and related technologies to develop custom applications on the Salesforce platform. JavaScript-Developer-I exam measures the candidate's knowledge of the fundamental concepts of JavaScript, including data types, control structures, functions, arrays, and objects, as well as their ability to apply this knowledge to solve real-world programming problems.

Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q57-Q62):

NEW QUESTION # 57
A developer is asked to fix some bugs reported by users. To do that, the developer adds a breakpoint for debugging.
Function Car (maxSpeed, color){
This.maxspeed =masSpeed;
This.color = color;
Let carSpeed = document.getElementById(' CarSpeed');
Debugger;
Let fourWheels =new Car (carSpeed.value, 'red');
When the code execution stops at the breakpoint on line 06, which two types of information are available in the browser console ?
Choose 2 answers:

A. The style, event listeners and other attributes applied to the carSpeed DOM element
B. The information stored in the window.localStorage property
C. A variable displaying the number of instances created for the Car Object.
D. The values of the carSpeed and fourWheels variables

Answer: A,B

NEW QUESTION # 58
is below:
<input type="file" onchange="previewFile()">
<img src="" height="200" alt="Image Preview..."/>
The JavaScript portion is:
01 function previewFile(){
02 const preview = document.querySelector('img');
03 const file = document.querySelector('input[type=file]').files[0];
04 //line 4 code
05 reader.addEventListener("load", () => {
06 preview.src = reader.result;
07 },false);
08 //line 8 code
09 }
In lines 04 and 08, which code allows the user to select an image from their local
computer , and to display the image in the browser?

A. 04 const reader = new File();
08 if (file) URL.createObjectURL(file);
B. 04 const reader = new FileReader();
08 if (file) reader.readAsDataURL(file);
C. 04 const reader = new FileReader();
08 if (file) URL.createObjectURL(file);
D. 04 const reader = new File();
08 if (file) reader.readAsDataURL(file);

Answer: B

NEW QUESTION # 59
Refer to the code below:

Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a specific element, myElement on the page had been clicked?

Answer:

Explanation:
event.target.id =='myElement'

NEW QUESTION # 60
const str = ' Salesforce ' ;
Which two statements result in the word " Sales " ?

A. str.substring(0, 5);
B. str.substring(0, 5);
C. str.substr(0, 5);
D. str.substr(s, 5);

Answer: A,C

Explanation:
Comprehensive and Detailed Explanation:
* " Salesforce " indices: S(0) a(1) l(2) e(3) s(4) f(5) ...
A / C (substring(0, 5)):
* substring(start, end) returns characters from start up to but not including end.
* str.substring(0, 5) # characters at indices 0,1,2,3,4 # " Sales " .
D (substr(0, 5)):
* substr(start, length) returns length characters starting at start.
* str.substr(0, 5) # 5 chars from index 0 # " Sales " .
B is invalid because s is not defined; it should be 0. So the two correct statements are A and D.

NEW QUESTION # 61
Which option is true about the strict mode in imported modules?

A. You can only reference notStrict () functions from the imported module.
B. Add the statement use strict = false, before any other statements In the module to enable not-strict mode.
C. Add the statement use non-strict; before any other statement in the module to enable not strict mode.
D. Imported modules are in strict model whether you declare them as such or not.

Answer: A

NEW QUESTION # 62
......

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