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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q47-Q52):

NEW QUESTION # 47
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) reader.readAsDataURL(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 FileReader();
08 if (file) URL.createObjectURL(file);

Answer: C

NEW QUESTION # 48
Refer to the code below:
for(let number =2 ; number <= 5 ; number += 1 ) {
// insert code statement here
}
The developer needs to insert a code statement in the location shown. The code
statement has these requirements:
1. Does require an import
2. Logs an error when the boolean statement evaluates to false
3. Works in both the browser and Node.js
Which meet the requirements?

A. console.assert(number % 2 === 0);
B. assert (number % 2 === 0);
C. console.debug(number % 2 === 0);
D. console.error(number % 2 === 0);

Answer: D

NEW QUESTION # 49
Given the JavaScript below:
function onLoad() {
console.log( " Page has loaded! " );
}
Where can the developer see the log statement after loading the page in the browser?

A. On the terminal console running the web server
B. On the webpage console log
C. In the browser performance tools log
D. On the browser JavaScript console

Answer: D

Explanation:
console.log() in browser-side JavaScript writes output to the browser's JavaScript console , which is available in the browser's Developer Tools.
* In a typical browser (Chrome, Firefox, Edge, etc.), you open DevTools and go to the Console tab.
* Any console.log( " Page has loaded! " ); executed in page JavaScript will appear there.
Why A is correct:
* The function onLoad is a client-side function (runs in the browser).
* When it executes, the console.log call goes to the browser's JavaScript console , not the server.
Why the others are incorrect:
* B. On the terminal console running the web server
* That console shows logs from the server-side runtime (e.g., Node.js logs).
* This code is clearly browser-side JavaScript (no Node.js or server context shown).
* Therefore, the output does not appear in the terminal.
* C. In the browser performance tools log
* Performance tools (Timeline, Performance tab, etc.) show metrics about rendering, CPU time, network, etc., not generic console.log messages.
* console.log messages appear in the Console tab, not in performance logs.
* D. On the webpage console log
* There is no built-in concept of a "webpage console log" UI rendered on the page itself by default.
* Unless you explicitly code something to display logs in the DOM, console.log output is not visible on the page, only in Developer Tools.
Therefore, the correct place to see that log is:
The answer: A
JavaScript knowledge / Study Guide references (concept names only, no links):
* Browser Developer Tools - Console tab
* console.log() in client-side JavaScript
* Difference between client-side logs and server-side logs

NEW QUESTION # 50
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. Export default class {
foo() { return 'foo' ; }
bar() { return 'bar' ; }
}
B. const foo = () => { return 'foo' ; }
const bar = () => { return 'bar' ; }
export { bar, foo }
C. const foo = () => { return 'foo';}
const bar = () => {return 'bar'; }
Export default foo, bar;
D. // FooUtils.js and BarUtils.js exist
Import (foo) from '/path/FooUtils.js';
Import (boo) from ' /path/NarUtils.js';

Answer: A,B

NEW QUESTION # 51
Refer to the code below:
Function changeValue(obj) {
Obj.value = obj.value/2;
}
Const objA = (value: 10);
Const objB = objA;
changeValue(objB);
Const result = objA.value;
What is the value of result after the code executes?

A. Undefined
B. Nan
C. 0
D. 1

Answer: C

NEW QUESTION # 52
......

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