Laden Sie die neuesten DeutschPrüfung JS-Dev-101 PDF-Versionen von Prüfungsfragen kostenlos von Google Drive herunter: https://drive.google.com/open?id=1dCzR12_dnPgNRztHHoulOggQPkru4OVB
Wenn Sie sich an der Salesforce JS-Dev-101 Zertifizierungsprüfung beteiligen, wählen Sie doch DeutschPrüfung, was Erfolg bedeutet. Viel glück!
| Thema | Einzelheiten |
|---|---|
| Thema 1 |
|
| Thema 2 |
|
| Thema 3 |
|
| Thema 4 |
|
| Thema 5 |
|
>> Salesforce JS-Dev-101 Zertifizierungsprüfung <<
Im Informationszeitalter kümmern sich viele Leute um die IT-Branche. Aber es fehlen trozt den vielen Exzellenten doch IT-Fachleute. Viele Firmen stellen ihre Angestellte nach ihren Fragenkataloge Zertifikaten ein. Deshalb sind die Zertifikate bei den Firmen sehr beliebt. Aber es ist nicht so leicht, diese Zertifikate zu erhalten. Die Salesforce JS-Dev-101 Zertifizierungsprüfung ist eine schwierige Zertifizierungsprüfung. Obwohl viele Menschen beteiligen sich an der Salesforce JS-Dev-101 Zertifizierungsprüfung, ist jedoch die Pass-Quote eher niedrig.
104. Frage
Why does second have access to variable a?
Antwort: A
Begründung:
The variable a is declared in the outer function's scope. An inner function (second) forms a closure over its outer lexical scope, so it can access a. The reason is the scope chain / outer function's scope, not prototypes or hoisting.
105. Frage
Refer to the code below:
01 new Promise((resolve, reject) => {
02 const fraction = Math.random();
03 if (fraction > 0.5) reject('fraction > 0.5, ' + fraction);
04 resolve(fraction);
05 })
06 .then(() => console.log('resolved'))
07 .catch((error) => console.error(error))
08 .finally(() => console.log('when am I called?'));
When does Promise.finally on line 08 get called?
Antwort: C
Begründung:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
Behavior of Promise.prototype.finally:
.finally(handler) registers a callback that runs when the promise is settled, meaning:
Either fulfilled (resolved), or
rejected.
Important points:
The finally callback does not receive the promise's value or error (unlike then and catch).
It is executed after the promise is settled, but before the resolution value or rejection reason is passed further down the chain.
It runs in both success and failure paths.
In the given code:
The promise may either:
Call reject('fraction > 0.5, ' + fraction) if fraction > 0.5, or
Call resolve(fraction) otherwise.
In both cases:
If it resolves, .then(() => console.log('resolved')) runs, and then .finally(...) is executed.
If it rejects, .catch((error) => console.error(error)) runs, and then .finally(...) is executed.
So .finally runs:
Not just "when rejected".
Not just "when resolved".
But whenever the promise is resolved or rejected.
Therefore, the correct choice is:
D . When resolved or rejected.
106. Frage
A developer needs the function personalizeWebsiteContent to run when the webpage is fully loaded (HTML and all external resources).
Which implementation should be used?
Antwort: C
Begründung:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge JavaScript defines two main page-loading events:
DOMContentLoaded
Fires when the HTML document has been completely parsed.
External resources like images, stylesheets, iframe contents, etc. may not be loaded yet.
load event on window
Fires when:
HTML is fully parsed
All dependent resources (images, scripts, CSS, fonts, etc.) are fully loaded The requirement states:
"when the webpage is fully loaded (HTML content and all related files)" This aligns exactly with the window load event.
Implementation:
window.addEventListener("load", personalizeWebsiteContent);
This matches option B.
________________________________________
JavaScript knowledge references (text-only)
DOMContentLoaded fires after HTML parsing only.
load fires after all page resources finish loading.
The window object is the correct target for listening to the full load event.
107. Frage
Refer to the code below:
01 function myFunction(reassign) {
02 let x = 1;
03 var y = 1;
04
05 if (reassign) {
06 let x = 2;
07 var y = 2;
08 console.log(x);
09 console.log(y);
10 }
11
12 console.log(x);
13 console.log(y);
14 }
What is displayed when myFunction(true) is called?
Antwort: B
Begründung:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
This question tests understanding of let (block scope) and var (function scope) in JavaScript.
Initial declarations in the function:
let x = 1; // line 2
var y = 1; // line 3
Here:
x is declared with let, so it is block-scoped to the function body.
y is declared with var, so it is function-scoped to the entire function.
Inside the if (reassign) block (and since reassign is true, we enter it):
if (reassign) {
let x = 2; // line 6
var y = 2; // line 7
console.log(x); // line 8
console.log(y); // line 9
}
Detailed behavior:
let x = 2; on line 6 creates a new block-scoped variable x that exists only inside the if block. It does not change the outer x declared on line 2.
var y = 2; on line 7 declares y with var again, but var is function-scoped. This effectively reassigns the same y defined on line 3 for the entire function. After this line, y is 2 everywhere in the function.
Now, inside the if block:
console.log(x); (line 8) logs the inner block-scoped x, which is 2.
console.log(y); (line 9) logs y, which is the function-scoped y that was set to 2.
So the first two outputs are:
2
2
After the if block, execution continues:
console.log(x); // line 12
console.log(y); // line 13
Outside the if block:
The block-scoped let x = 2; no longer exists; it was only visible inside the if block.
The outer let x = 1; (line 2) is still in scope and has not been changed.
Thus:
console.log(x); (line 12) logs the outer x, which is still 1.
console.log(y); (line 13) logs y which, due to var y = 2; inside the if, is now 2 for the whole function.
Therefore, when myFunction(true) is called, the output in order is:
2 (inner x in if)
2 (function-scoped y after reassignment)
1 (outer x after if)
2 (function-scoped y remains 2)
This corresponds to:
JavaScript knowledge / study guide reference concepts:
let declarations and block scope
var declarations and function scope
Shadowing of variables with let inside a block
Re-declaration and reassignment of var within a function
Execution order of statements and console output
________________________________________
108. Frage
Given:
const str = 'Salesforce';
Which two statements result in 'Sales'?
Antwort: A,C
Begründung:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
str = 'Salesforce'
Index positions:
S(0) a(1) l(2) e(3) s(4) f(5) o(6) r(7) c(8) e(9)
substring(start, end)
Start index inclusive, end index exclusive.
str.substring(0, 5) → characters at indices 0-4 → "Sales"
str.substring(1, 5) → indices 1-4 → "ales"
substr(start, length)
Start index, then number of characters.
str.substr(0, 5) → 5 characters starting at index 0 → "Sales"
str.substr(1, 5) → 5 characters from index 1 → "alesf"
So the expressions that return "Sales" are A and C.
________________________________________
109. Frage
......
Mit der Entwicklung der IT-Industrie nimmt die Zahl der IT-Lerner seit Jahren immer zu. Das führt zu immer stärkerer Konkurrenzen. Und es ist undenkbar, dass Sie in IT-Industrie von anderen überschritten sind. Deshalb sollen Sie Ihre Fähigkeit ständig erhöhen und Ihre Stärke zu anderen beweisen. Wie können Sie Ihre Fähigkeit zu anderen beweisen? Immer mehr Leute wählen IT-Zertifizierungen, Ihre Fähigkeit zu beweisen. Wollen Sie auch? Kommen Sie zuerst zu Salesforce JS-Dev-101 Zertifizierungsprüfung. Das ist die wichtigste Salesforce Prüfung und auch von vielen Unternehmen anerkannt.
JS-Dev-101 Trainingsunterlagen: https://www.deutschpruefung.com/JS-Dev-101-deutsch-pruefungsfragen.html
Laden Sie die neuesten DeutschPrüfung JS-Dev-101 PDF-Versionen von Prüfungsfragen kostenlos von Google Drive herunter: https://drive.google.com/open?id=1dCzR12_dnPgNRztHHoulOggQPkru4OVB