Free Access Salesforce.CRT-600.v2024-04-28.q92 Practice Test (Page 9)

Question 36

myArraym can have one level, two levels, or more levels.
Which statement flattens myArray when it can be arbitrarily nested?

A.[ ] .concat {. . .myArray) ;

B.myArray. join (","). split (",");

C.myArray. reduce ((prev, curr) => prev.concat(curr) [ ]);

D.myArray.flat(Infinity);

Question 37

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); };
}

Question 38

A developer implements and calls the following code when an application state change occurs:
Const onStateChange =innerPageState) => {
window.history.pushState(newPageState, ' ', null);
}
If the back button is clicked after this method is executed, what can a developer expect?

A.The page is navigated away from and the previous page in the browser's history is loaded.

B.A navigate event is fired with a state property that details the previous application state.

C.A popstate event is fired with a state property that details the application's last state.

D.The page reloads and all Javascript is reinitialized.