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NEW QUESTION # 121
Given the HTML below:
< div >
< div id= " row-uc " > Universal Containers < /div >
< div id= " row-as " > Applied Shipping < /div >
< div id= " row-bt " > Burlington Textiles < /div >
< /div >
Which statement adds the priority-account CSS class to the Applied Shipping row?
Answer: C
Explanation:
* document.querySelector( ' #row-as ' ) returns the single element with id row-as.
* That element has a classList property with add, remove, etc.
Correct usage:
document.querySelector( ' #row-as ' ).classList.add( ' priority-account ' ); Why others are wrong:
* A: querySelectorAll returns a NodeList, not a single element, so it does not have a classList property.
* C: DOM elements do not have a classes array or push; they have classList.
* D: document.getElementById( ' row-as ' ) is fine to get the element, but there is no addClass method in standard DOM; that's a jQuery-style API, not vanilla JS.
NEW QUESTION # 122
Which three browser specific APIs are available for developer to persist data between page loads?
Choose 3 answers
Answer: A,C,D
NEW QUESTION # 123
Given the code below:
01 setTimeout(() = > {
02 console.log(1);
03 }, 1100);
04 console.log(2);
05 new Promise((resolve, reject) = > {
06 setTimeout(() = > {
07 reject(console.log(3));
08 }, 1000);
09 }).catch(() = > {
10 console.log(4);
11 });
12 console.log(5);
What is logged to the console?
Answer: A
Explanation:
We must track synchronous code, setTimeout callbacks (macrotasks), and Promise rejection handling (microtasks).
Step-by-step:
* Synchronous code first:
* Line 01-03: Schedules a timeout at 1100 ms: logs 1 (later).
* Line 04: console.log(2); # logs 2.
* Lines 05-09: Construct a new Promise.
* The executor runs immediately.
* Inside it, another setTimeout is set for 1000 ms:
* setTimeout(() = > {
* reject(console.log(3));
* }, 1000);
* Line 09-11: .catch(() = > { console.log(4); }) attached to the promise.
* Line 12: console.log(5); # logs 5.
So after all synchronous code, the console has:
* 2
* 5
* At 1000 ms: inner setTimeout fires
The callback:
() = > {
reject(console.log(3));
}
Inside:
* console.log(3) runs first , logging 3.
* console.log(3) returns undefined.
* Then reject(undefined) is called.
So at about 1000 ms, we log:
* 3
When the promise is rejected:
* The .catch handler is scheduled as a microtask .
* After the current macrotask (the timeout callback) completes, the microtask queue runs.
* Thus .catch(() = > { console.log(4); }) runs shortly after, in the same 1000 ms tick.
So immediately after 3, the catch handler logs:
* 4
Now the logs in order are:
* 2
* 5
* 3
* 4
* At 1100 ms: outer setTimeout fires
* The callback from line 01 runs:
console.log(1);
* Logs: 1.
Final log order:
* 2 (line 4, sync)
* 5 (line 12, sync)
* 3 (1000 ms timeout, then inside logs before reject)
* 4 (promise catch microtask after rejection)
* 1 (1100 ms timeout)
Concatenated: 25341.
Therefore, the correct option is:
The answer: A
Study Guide / Concept References (no links):
* Event loop: call stack, macrotask queue (timers), microtask queue (promises)
* setTimeout scheduling and ordering
* Promise rejection, .catch, and microtasks
* Evaluation order of function arguments (reject(console.log(3)))
NEW QUESTION # 124
Given the code below:
01 function Person(name, email) {
02 this.name = name;
03 this.email = email;
04 }
05
06 const john = new Person( ' John ' , ' john@email.com ' );
07 const jane = new Person( ' Jane ' , ' jane@email.com ' );
08 const emily = new Person( ' Emily ' , ' emily@email.com ' );
09
10 let usersList = [john, jane, emily];
Which method can be used to provide a visual representation of the list of users and to allow sorting by the name or email attribute?
Answer: B
Explanation:
We have an array of plain objects:
[
{ name: ' John ' , email: ' john@email.com ' },
{ name: ' Jane ' , email: ' jane@email.com ' },
{ name: ' Emily ' , email: ' emily@email.com ' }
]
We want:
* A "visual representation" of the list.
* Ability to sort by name or email in DevTools.
console.table:
* console.table(data) renders data as a table in most browser devtools and Node consoles that support it.
* Each object becomes a row; properties (name, email) become columns.
* Many DevTools UIs allow:
* Clicking column headers to sort by that column.
* Filtering / viewing in a structured way.
So:
console.table(usersList);
Displays a sortable table of users by name or email. This matches the requirement exactly.
Other options:
* console.group(usersList);
* Starts a console group. The argument is just logged as a line label.
* It does not create a table or sortable view; it just groups subsequent logs.
* console.groupCollapsed(usersList);
* Same grouping behavior, but collapsed by default.
* Again, no table or sortable columns.
* console.info(usersList);
* Logs the array in the console, but as a standard log/info.
* You can expand objects, but there is no table view or built-in column sorting.
Therefore, the correct method is:
The answer: A
Study Guide / Concept References (no links):
* console.table for tabular logging
* console.group and console.groupCollapsed for grouped logs
* console.log / console.info standard logging behavior
* DevTools UI support for sorting columns in console.table
NEW QUESTION # 125
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?
Answer: C
Explanation:
} catch(error) { console.log('ERROR' , error); };
}
NEW QUESTION # 126
......
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