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Salesforce Certified JavaScript Developer I Sample Questions (Q28-Q33):

NEW QUESTION # 28
A developer is leading the creation of a new web server for their team that will fulfill API requests from an existing client.
The team wants a web server that runs on Node.Js, and they want to use the new web framework Minimalist.Js. The lead developer wants to advocate for a more seasoned back-end framework that already has a community around it.
Which two frameworks could the lead developer advocate for?
Choose 2 answers

  • A. Gatsby
  • B. Angular
  • C. Koa
  • D. Express

Answer: B,D


NEW QUESTION # 29
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.connect (( ) => {
    console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }};
  • B. ws.on ('connect', ( ) => {
    console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' , error); });
    });
  • C. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};
  • D. try{
    ws.connect (( ) => {
    console.log('connected to client'); });
    } catch(error) { console.log('ERROR' , error); };
    }

Answer: C


NEW QUESTION # 30
Refer to the code below:
Const pi = 3.1415326,
What is the data type of pi?

  • A. Number
  • B. Double
  • C. Decimal
  • D. Float

Answer: A


NEW QUESTION # 31
Considering type coercion, what does the following expression evaluate to?
True + '13' + NaN

  • A. ' true13NaN '
  • B. ' true13 '
  • C. ' 113Nan '
  • D. 0

Answer: A


NEW QUESTION # 32
Refer to the following code:
CRT-600-9790d3ff25a21bf74de84bec434c1d47.jpg
Which two statement could be inserted at line 17 to enable the function call on line 18?
Choose 2 answers

  • A. Object.assign (leo, tony);
  • B. Object.assign (leo. Tiger);
  • C. leo.roar = () => { console.log('They\'re pretty good!'); );
  • D. leo.prototype.roar = ( ) =>( console.log('They\'re pretty good!'); };

Answer: A,C


NEW QUESTION # 33
......

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