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Salesforce JavaScript-Developer-I Exam keywords

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Salesforce Certified JavaScript Developer I Exam Sample Questions (Q14-Q19):

NEW QUESTION # 14
Refer to the code below:

Which value can a developer expect when referencing country,capital,cityString?

A. 'NaN'
B. An error
C. undefined
D. 'London'

Answer: A

NEW QUESTION # 15
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?

A. A
B. D
C. B
D. C

Answer: A

NEW QUESTION # 16
Which javascript methods can be used to serialize an object into a string and deserialize a JSON string into an object, respectively?

A. JSON.encode and JSON.decode
B. JSON.serialize and JSON.deserialize
C. JSON.parse and JSON.deserialize
D. JSON.stringify and JSON.parse

Answer: D

NEW QUESTION # 17
A developer is working on an ecommerce website where the delivery date is dynamically calculated based on the current day. The code line below is responsible for this calculation.
Const deliveryDate = new Date ();
Due to changes in the business requirements, the delivery date must now be today's date + 9 days.
Which code meets this new requirement?

A. deliveryDate.date = new Date(+9) ;
B. deliveryDate.setDate(( new Date ( )).getDate () +9);
C. deliveryDate.setDate( Date.current () + 9);
D. deliveryDate.date = Date.current () + 9;

Answer: B

NEW QUESTION # 18
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
● Will establish a web socket connection and handle receipt of messages to the server
● Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?

A. ws.on ('connect', ( ) => {
console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' , error); });
});
B. ws.connect (( ) => {
console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }};
C. try{
ws.connect (( ) => {
console.log('connected to client'); });
D. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};

Answer: D

Explanation:
} catch(error) { console.log('ERROR' , error); };
}

NEW QUESTION # 19
......

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