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Salesforce Certified JavaScript Developer I Exam Sample Questions (Q104-Q109):

NEW QUESTION # 104
is below:
input type="file"
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) URL.createObjectURL(file);
  • B. 04 const reader = new File();
    08 if (file) URL.createObjectURL(file);
  • C. 04 const reader = new FileReader();
    08 if (file) reader.readAsDataURL(file);
  • D. 04 const reader = new File();
    08 if (file) reader.readAsDataURL(file);

Answer: C


NEW QUESTION # 105
developer uses the code below to format a date.

After executing, what is the value of formattedDate?

  • A. June 10, 2020
  • B. November 05, 2020
  • C. May 10, 2020
  • D. October 05, 2020

Answer: C


NEW QUESTION # 106
Refer to the code below:
new Promise((resolve, reject) = {
const fraction = Math.random();
if( fraction 0.5) reject("fraction 0.5, " + fraction);
resolve(fraction);
})
.then(() =console.log("resolved"))
.catch((error) = console.error(error))
.finally(() = console.log(" when am I called?"));

When does Promise.finally on line 08 get called?

  • A. When resolved and settled
  • B. WHen resolved
  • C. When rejected
  • D. When resolved or rejected

Answer: D


NEW QUESTION # 107

Which code change should be done for the console to log the following when 'Click me!' is clicked'
Row log
Table log

  • A. Remove line 10
  • B. Change line 10 to event.stopPropagation (false) ;
  • C. Remove lines 13 and 14
  • D. Change line 14 to elem.addEventListener ('click', printMessage, true);

Answer: A


NEW QUESTION # 108
Refer to the string below:
const str = 'Salesforce';
Which two statements result in the word 'Sales'?
Choose 2 answers

  • A. str.substr (0, 5);
  • B. str.substring (1, 5);
  • C. str.substr(1, 5);
  • D. str.substring (0, 5);

Answer: A,D


NEW QUESTION # 109
......

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