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NEW QUESTION 53
Refer to the following code:
Let sampleText = 'The quick brown fox jumps';
A developer needs to determine if a certain substring is part of a string.
Which three expressions return true for the given substring ?
Choose 3 answers
NEW QUESTION 54
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?
NEW QUESTION 55
Refer to the code below:
What are the values for first and second once the executes?
NEW QUESTION 56
In which situation should a developer include a try... catch block around their function call?
NEW QUESTION 57
......
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NEW QUESTION 53
Refer to the following code:
Let sampleText = 'The quick brown fox jumps';
A developer needs to determine if a certain substring is part of a string.
Which three expressions return true for the given substring ?
Choose 3 answers
- A. sampleText.includes(' fox ');
- B. sampleText.includes(' quick ', 4);
- C. sampleText.includes(' quick ') !== -1;
- D. sampleText.includes(' Fox ', 3)
- E. sampleText.includes('fox');
NEW QUESTION 54
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. try{
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.connect (( ) => {
console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }}; - D. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};
NEW QUESTION 55
Refer to the code below:
What are the values for first and second once the executes?
- A. First is who and second is when.
- B. First is why and second is when.
- C. First is who and second is where.
- D. First is why and second is where.
NEW QUESTION 56
In which situation should a developer include a try... catch block around their function call?
- A. The function results in an out of memory issue.
- B. The function might raise a runtime error that needs to be handled.
- C. The function has an error that should not be silenced.
- D. The function contains scheduled code.
NEW QUESTION 57
......
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