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Salesforce Certified JavaScript Developer I Exam Sample Questions (Q174-Q179):

NEW QUESTION # 174
developer wants to use a module named universalContainersLib and them call functions from it.
How should a developer import every function from the module and then call the functions foo and bar ?

A. import * ad lib from '/path/universalContainersLib.js';
lib.foo();
lib.bar();
B. import * from '/path/universalContaineraLib.js';
universalContainersLib.foo();
universalContainersLib.bar();
C. import all from '/path/universalContaineraLib.js';
universalContainersLib.foo();
universalContainersLib.bar();
D. import (foo, bar) from '/path/universalContainersLib.js';
foo();
bar();

Answer: A

NEW QUESTION # 175
Refer to the code below:

Considering that JavaScript is single-threaded, what is the output of line 08 after the code executes?

A. 0
B. 1
C. 2
D. 3

Answer: D

NEW QUESTION # 176
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 array after the code executes?

A. [1, 2, 3, 5]
B. [1, 2, 3, 4, 5, 4, 4]
C. [1, 2, 3, 4, 5, 4]
D. [1, 2, 3, 4, 4, 5, 4]

Answer: D

Explanation:

NEW QUESTION # 177
A developer wants to use a module named universalContainersLib andthen call functions from it.
How should a developer import every function from the module and then call the functions foo and bar?

A. import * from '/path/universalContainersLib.js';universalContainersLib. foo ()7universalContainersLib.bar ();
B. import{foo,bar} from '/path/universalCcontainersLib.js';foo():bar()?
C. import * as lib from '/path/universalContainersLib.js';lib.foo();lib. bar ();
D. import all from
'/path/universalContainersLib.js';universalContainersLib.foo();universalContainersLib.bar ();

Answer: C

NEW QUESTION # 178
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) URL.createObjectURL(file);
B. 04 const reader = new FileReader();
08 if (file) reader.readAsDataURL(file);
C. 04 const reader = new File();
08 if (file) URL.createObjectURL(file);
D. 04 const reader = new File();
08 if (file) reader.readAsDataURL(file);

Answer: B

NEW QUESTION # 179
......

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