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How to Prepare for Salesforce JavaScript Developer I Exam
Preparation Guide for Salesforce JavaScript Developer I Exam
Introduction
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How much Salesforce JavaScript-Developer-I Exam Cost
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Salesforce Certified JavaScript Developer I Exam Sample Questions (Q106-Q111):
NEW QUESTION # 106
A developer is creating a simple webpage with a button. When a user clicks this button
for the first time, a message is displayed.
The developer wrote the JavaScript code below, but something is missing. The
message gets displayed every time a user clicks the button, instead of just the first time.
01 function listen(event) {
02 alert ( 'Hey! I am John Doe') ;
03 button.addEventListener ('click', listen);
Which two code lines make this code work as required?
Choose 2 answers
- A. On line 04, use button.removeEventListener(' click" , listen);
- B. On line 06, add an option called once to button.addEventListener().
- C. On line 04, use event.stopPropagation ( ),
- D. On line 02, use event.first to test if it is the first execution.
Answer: A,B
NEW QUESTION # 107
Refer to the code below:
A developer import a library that creates a web server. the imported library uses events and callback to start the server.
Which code should be inserted at line 03 to set up an event and start the web server?
- A. server( );
- B. Server .start();
- C. server ( (port) => (
Console.log ('Listening on' , port) ;
}}; - D. Server. on ('connet' , (port) => (
Console.log (Listening on' port);
}};
Answer: C
NEW QUESTION # 108
Refer to the code below:
What is the output of this function when called with an empty array?
- A. Return NaN
- B. Return 0
- C. Return Infinity
- D. Return 5
Answer: D
NEW QUESTION # 109
Refer to the following code:
What is the output of line 11?
- A. [1, 2]
- B. [''bar'' , ''foo'']
- C. [''foo:1'', ''bar:2'']
- D. ['foo'', ''bar'']
Answer: D
NEW QUESTION # 110
A developer is debugging a web server that uses Node.js The server hits a runtimeerror
every third request to an important endpoint on the web server.
The developer added a break point to the start script, that is at index.js at he root of the
server's source code. The developer wants to make use of chrome DevTools to debug.
Which command can be run to access DevTools and make sure the breakdown is hit ?
- A. Node --inspect index.js
- B. node -i index.js
- C. Node inspect index.js
- D. Node --inspect-brk index.js
Answer: A
NEW QUESTION # 111
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