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Salesforce Certified JavaScript Developer I Exam Sample Questions (Q148-Q153):

NEW QUESTION # 148
Refer to the following code:

What is the output of line 11?

A. [1,2]
B. ["foo", "bar"]
C. ["bar", "foo"]
D. ["foo:1", "bar:2"]

Answer: B

NEW QUESTION # 149
Refer to the code below:

Which two statements correctly execute the runparallel () function?
Choose 2 answers

A. runParallel () , done (function ( data)(return data; }};
B. Async runParalled (). Then (data) :
C. runParallel () , then (function ) (date) { } 0;
D. runParralel () . then (data );

Answer: B,C

NEW QUESTION # 150
A developer implements and calls the following code when an application state change occurs:

If the back button is clicked after this method is executed, what can a developer expect?

A. The page is navigated away from and previous page in the browser's history is loaded.
B. The page reloads and all JavaScript is reinitialized.
C. A navigate event is fired with a state properly that details previous application state.
D. A popstate event is fired with a state properly that details the application's last state.

Answer: A

NEW QUESTION # 151
is below:
<input type="file" onchange="previewFile()">
<img src="" height="200"alt="Image Preview..."/>
The JavaScript portion is:
01 functionpreviewFile(){
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 FileReader();08if (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) URL.createObjectURL(file);

Answer: C

NEW QUESTION # 152
developer wants to use a module nameduniversalContainersLib and them callfunctions from it.
How should a developer import every function from the module and then call the functions foo and bar ?

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

Answer: C

NEW QUESTION # 153
......

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