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[General] Test JS-Dev-101 Tutorials - New JS-Dev-101 Braindumps Free

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【General】 Test JS-Dev-101 Tutorials - New JS-Dev-101 Braindumps Free

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q94-Q99):NEW QUESTION # 94
Refer to thefollowing code that imports a module named utils:
import (foo, bar) from '/path/Utils.js';
foo() ;
bar() ;
Which two implementations of Utils.js export foo and bar such that the code above runs without error?
Choose 2 answers
  • A. const foo = () => { return 'foo' ; }const bar = () => { return 'bar' ; }export { bar, foo }
  • B. // FooUtils.js and BarUtils.js existImport (foo) from '/path/FooUtils.js';Import (boo) from ' /path/NarUtils.js';
  • C. const foo = () => { return 'foo';}const bar = () => {return 'bar'; }Export default foo, bar;
  • D. Export default class {foo() { return 'foo' ; }bar() { return 'bar' ; }}
Answer: A,D

NEW QUESTION # 95
Refer to the code below:
Function changeValue(obj) {
Obj.value = obj.value/2;
}
Const objA = (value: 10);
Const objB = objA;
changeValue(objB);
Const result = objA.value;
What is the value of result after the code executes?
  • A. Undefined
  • B. Nan
  • C. 0
  • D. 1
Answer: D

NEW QUESTION # 96
A developer creates a genericfunction to log custom messages in the console. To do this, the function below is implemented.
01 function logStatus(status){
02 console./*Answer goes here*/{'Item status is: %s', status};
03 }
Which three console logging methods allow the use of string substitution in line 02?
  • A. Error
  • B. Log
  • C. Message
  • D. Assert
  • E. Info
Answer: A,B,E

NEW QUESTION # 97
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?
  • A. 0
  • B. 1
  • C. 2
  • D. 3
Answer: C
Explanation:
Comprehensive and Detailed Explanation From JavaScript Knowledge:
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:
Study Guide / Concept Reference (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 # 98
Refer to the HTML below:
<div id="main">
<ul>
<li>Leo</li>
<li>Tony</li>
<li>Tiger</li>
</ul>
</div>
Which JavaScript statement results in changing " Tony" to "Mr. T."?
  • A. document.querySelector('$main li:second-child').innerHTML = ' Mr. T. ';
  • B. document.querySelector('$main li:nth-child(2)'),innerHTML =' Mr. T. ';
  • C. document.querySelectorAll('$main $TONY').innerHTML = ' Mr. T. ';
  • D. document.querySelector('$main li.Tony').innerHTML = ' Mr. T. ';
Answer: B

NEW QUESTION # 99
......
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