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Salesforce Certified JavaScript Developer I Exam Sample Questions (Q31-Q36):

NEW QUESTION # 31
Refer to the code:

Given the code above, which three properties are set pet1?
Choose 3 answers:

A. Size
B. canTalk
C. Type
D. Owner
E. Name

Answer: A,B,C

NEW QUESTION # 32
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 FileReader();
08 if (file) reader.readAsDataURL(file);
B. 04 const reader = new File();
08 if (file) URL.createObjectURL(file);
C. 04 const reader = new File();
08 if (file) reader.readAsDataURL(file);
D. 04 const reader = new FileReader();
08 if (file) URL.createObjectURL(file);

Answer: A

NEW QUESTION # 33
Refer to the expression below:
Let x = ('1' + 2) == (6 + 2) ;
How should this expression be modified to ensure that a evaluated to false?

A. Let x = (1' + '2') == ('6' / 2) ;
B. Let x = (1' + '2') === (6 + 2) ;
C. Let x = (1' + '2') === (6 / 2) ;
D. Let x = (1' + '2') == (6 + 2) ;

Answer: B

NEW QUESTION # 34
Given the code below:

Which method can be used to provide a visual representation of the list of users and to allow sorting by the name or email attribute?

A. console.groupCol lapsed (usersList) ;
B. console.table(usersList) ;
C. console.info(usersList) ;
D. console.group(usersList) ;

Answer: D

NEW QUESTION # 35
A developer is wondering whether to use, Promise.then or Promise.catch, especially
when a Promise throws an error?
Which two promises are rejected?
Which 2 are correct?

A. New Promise(() => (throw 'cool error here'}).then(null, error => console.error(error)));
B. Promise.reject('cool error here').catch(error => console.error(error));
C. New Promise((resolve, reject) => (throw 'cool error here'}).catch(error =>
console.error(error)) ;
D. Promise.reject('cool error here').then(error => console.error(error));

Answer: B,C

NEW QUESTION # 36
......

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