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Benefits in Obtaining Salesforce JavaScript-Developer-I Certification
With the introduction of the Lightning Experience by Salesforce, it is possible to develop cool, looking applications for a wide range of tasks. Admins have been able to create beautiful pages for their objects more than ever, with an interface entirely tailored for each user.For developers, the same application has never before been possible for Salesforce developers to create applications that stretch well beyond Salesforce's declarative features. It's all achieved with the use of a JavaScript application for Lightning & Lightning Web components.
The certification for JavaScript Developer I has just been released and fills a large gap in the certification list for Salesforce. Salesforce Developers who want to prove their Lightning skills, but also new entrants into the Salesforce community, are certified to demonstrate that they know what is relevant. A typical Salesforce 60 multi-choice test is split into two parts and is influenced by a super badge (Similar to Developer II certification).
To become a Salesforce Certified JavaScript Developer, individuals must pass the JavaScript-Developer-I Certification Exam. JavaScript-Developer-I exam is designed to test a developer's knowledge of JavaScript programming, web development, and the Salesforce Lightning platform. JavaScript-Developer-I exam consists of 60 multiple-choice questions and has a time limit of 105 minutes.
NEW QUESTION # 69
Refer to the code below:
What is display when the cod executes?
- A. A
- B. Undefined
- C. ReferenceError: b is not defined
- D. null
Answer: A
NEW QUESTION # 70
Which code statement correctly retrieves and returns an object from localStorage?
- A. const retrieveFromLocalStorage = (storageKey) =>{return
JSON.parse(window.localStorage.getItem(storageKey));} - B. constretrieveFromLocalStorage = (storageKey) =>{return window.localStorage[storageKey];}
- C. const retrieveFromLocalStorage = (storageKey) =>{return window.localStorage.getItem(storageKey);}
- D. const retrieveFromLocalStorage = () =>{return
JSON.stringify(window.localStorage.getItem(storageKey));}
Answer: A
NEW QUESTION # 71
Refer to the following code that imports a module named utils:
import (foo, bar) from '/path/Utils.js';
foo() ;
bar() ;
Which two implementations of Utils.js export foo and bar such that the code above runs without
error?
Choose 2 answers
- A. const foo = () => { return 'foo';}
const bar = () => {return 'bar'; }
Export default foo, bar; - B. Export default class {
foo() { return 'foo' ; }
bar() { return 'bar' ; }
} - C. const foo = () => { return 'foo' ; }
const bar = () => { return 'bar' ; }
export { bar, foo } - D. // FooUtils.js and BarUtils.js exist
Import (foo) from '/path/FooUtils.js';
Import (boo) from ' /path/NarUtils.js';
Answer: B,C
NEW QUESTION # 72
Refer to the code below:
Which value can a developer expect when referencing country,capital,cityString?
- A. 'NaN'
- B. 'London'
- C. An error
- D. undefined
Answer: A
NEW QUESTION # 73
Refer to the code snippet below:
Let array = [1, 2, 3, 4, 4, 5, 4, 4];
For (let i =0; i < array.length; i++){
if (array[i] === 4) {
array.splice(i, 1);
}
}
What is the value of the array after the code executes?
- A. [1, 2, 3, 4, 4, 5, 4]
- B. [1, 2, 3, 4, 5, 4, 4]
- C. [1, 2, 3, 5]
- D. [1, 2, 3, 4, 5, 4]
Answer: D
NEW QUESTION # 74
Refer to the following object.
How can a developer access the fullName property for dog?
- A. Dog.fullName
- B. Dog, function, fullName
- C. Dog, get,fullName
- D. Dog.fullName ( )
Answer: A
NEW QUESTION # 75
A developer creates a generic function to log custom messages in the console. To do this, the function below is implemented.
01 function logStatus(status){
02 console./*Answer goes here*/{'Item status is: %s', status};
03 }
Which three console logging methods allow the use of string substitution in line 02?
- A. Info
- B. Error
- C. Assert
- D. Log
- E. Message
Answer: A,B,D
NEW QUESTION # 76
There is a new requirement for a developer to implement a currPrice method that will return the current price of the item or sales..
What is the output when executing the code above
- A. 50
80
72 - B. 50
Uncaught TypeError: saleItem,desrcription is not a function
50
80 - C. 50
80
50
72 - D. 50
80
Uncaught Reference Error:this,discount is undefined
72
Answer: C
NEW QUESTION # 77
Refer to the code below:
01 const server = require('server');
02 /* Insert code here */
A developer imports a library that creates a web server. Theimported library uses events and callbacks to start the servers Whichcode should be inserted at the line 03 to set up an event and start the web server ?
- A. serve(( port) => (
- B. server()
- C. console.log( 'Listening on ', port);
- D. Server.start ();
- E. server.on(' connect ' , ( port) => {console.log('Listening on ' , port) ;})
Answer: E
NEW QUESTION # 78
Which statement accurately describes the behaviour of the async/ await keyworks ?
- A. The associated function will always return a promise
- B. The associated class contains some asynchronous functions.
- C. Theassociated function can only be called via asynchronous methods
- D. The associated sometimes returns a promise.
Answer: D
NEW QUESTION # 79
A developer creates a class that represents a blog post based on the requirement that a Post should have a body author and view count.
The Code shown Below:
Class Post {
// Insert code here
This.body =body
This.author = author;
this.viewCount = viewCount;
}
}
Which statement should be inserted in the placeholder on line 02 to allow for a variable to be set to a new instanceof a Post with the three attributes correctly populated?
- A. Function Post (body, author, viewCount) {
- B. constructor (body, author, viewCount) {
- C. constructor() {
- D. super (body, author, viewCount) {
Answer: B
NEW QUESTION # 80
Refer to the code below:
<html lang="en">
<tableonclick="console.log(Table log');">
<tr id="row1">
<td>Click me!</td>
</tr>
<table>
<script>
functionprintMessage(event) {
console.log('Row log');
}
Let elem = document.getElementById('row1');
elem.addEventListener('click', printMessage, false);
</script>
</html>
Which code change should be made for the console to log only Row log when 'Click me! ' is clicked?
- A. Add.event.stopPropagation(); to window.onLoad event handler.
- B. Add event.stopPropagation(); to printMessage function.
- C. Add event.removeEventListener(); toprintMessage function.
- D. Addevent.removeEventListener(); to window.onLoad event handler.
Answer: B
NEW QUESTION # 81
Which option is true about the strict mode in imported modules?
- A. Add the statement use non-strict, before any other statements in the module to enable not-strict mode.
- B. Imported modules are in strict mode whether you declare them as such or not.
- C. Add the statement use strict =false; before any other statements in the module to enable not- strict mode.
- D. You can only reference notStrict() functions from the imported module.
Answer: D
NEW QUESTION # 82
A developer has a module that contains multiple functions.
What kind of export should be leveraged so that multiple functions can be used?
- A. multi
- B. named
- C. default
- D. all
Answer: B
Explanation:
The correct answer is D .
When a module contains multiple functions and each function should be available individually, the best choice is a named export .
Example:
function add(a, b) {
return a + b;
}
function subtract(a, b) {
return a - b;
}
export { add, subtract };
Then another file can import exactly the functions it needs:
import { add, subtract } from ' ./mathUtils.js ' ;
console.log(add(5, 2));
console.log(subtract(5, 2));
Named exports are useful when a module provides several reusable functions, constants, or classes.
Why the other options are incorrect:
multi is not a JavaScript export type.
default is usually used when a module has one main value to export. A module can only have one default export.
all is not an export type in JavaScript module syntax.
Therefore, the correct export type for multiple functions is named export , so the verified answer is D .
NEW QUESTION # 83
Given the following code:
What is the logged by the first four log statements?
- A. 0 1 1 2
- B. 0 1 2 2
- C. 0 1 2 3
- D. 0 0 1 2
Answer: A
NEW QUESTION # 84
Given the code below:
What is logged to the console'
- A. 1 2 3 4 5
- B. 2 5 3 4 1
- C. 1 2 5 3 4
- D. 2 5 1 3 4
Answer: B
NEW QUESTION # 85
A developer has an is Dog function that takes one argument cat. They want to schedule the function to run every minute.
What is the correct syntax for scheduling this function?
Answer:
Explanation:
setInterval(isDog, 60000,'cat');
NEW QUESTION # 86
function myFunction() {
a = a + b;
var b = 1;
}
myFunction();
console.log(a);
console.log(b);
Which statement is correct?
- A. Line 08 outputs the variable, but line 09 throws an error.
- B. Both line 02 and 03 are executed, but the values printed are undefined.
- C. Both line 02 and 03 are executed, and the variables are hoisted.
- D. Line 02 throws a reference error, therefore line 03 is never executed.
Answer: D
Explanation:
The correct answer is A , not D.
Inside myFunction(), the declaration:
var b = 1;
is hoisted to the top of the function scope, but only the declaration is hoisted, not the assignment. So internally, JavaScript treats the function approximately like this:
function myFunction() {
var b;
a = a + b;
b = 1;
}
Now examine this line:
a = a + b;
Before JavaScript can assign a value to a, it must first evaluate the right-hand side:
a + b
At this point:
b
exists locally because var b was hoisted, so its value is:
undefined
However:
a
has not been declared anywhere. Reading an undeclared variable causes a:
ReferenceError
So this line throws an error before assignment happens:
a = a + b;
Because the error occurs on that line, the next line inside the function is never executed:
var b = 1;
Also, because the error is not handled with try...catch, the program stops before reaching:
console.log(a);
console.log(b);
Therefore, the accurate statement is:
Line 02 throws a reference error, therefore line 03 is never executed.
So the verified answer is A .
NEW QUESTION # 87
Universal Containers (UC) just launched anew landing page, but users complain that the website is slow. A developer found some functions any that might cause this problem. To verify this, the developer decides to execute everything and log the time each of these three suspicious functions consumes.
Which function can the developer use to obtain the time spent by every one of the three functions?
- A. console. timeLog ()
- B. console.trace()
- C. console.getTime ()
- D. console.timeStamp ()
Answer: A
NEW QUESTION # 88
Refer to the following code:
- A. Inner message
Outer message - B. Outer message
- C. Button message
- D. Outer message
Inner message
Answer: C
NEW QUESTION # 89
Which statement phrases successfully?
- A. JSON.parse ( " foo " );
- B. JSON.parse(' " foo " ');
- C. JSON.parse ( ' foo ' );
- D. JSON.parse( " ' foo ' " );
Answer: B
NEW QUESTION # 90
developer publishes a new version of a package with new features that do not break backward compatibility. The previous version number was 1.1.3.
Following semantic versioning format, what should the new package version number be?
- A. 2.0.0
- B. 1.1.4
- C. 1.2.0
- D. 1.2.3
Answer: C
NEW QUESTION # 91
Refer to the following array:
Let arr1 = [ 1, 2, 3, 4, 5 ];
Which two lines of code result in a second array, arr2 being created such that arr2 is not
a reference to arr1?
- A. Let arr2 = arr1.sort();
- B. Let arr2 = arr1.slice(0, 5);
- C. Let arr2 = arr1;
- D. Let arr2 = Array.from(arr1);
Answer: B,D
NEW QUESTION # 92
......
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