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Salesforce JS-Dev-101 Prüfungsplan:

ThemaEinzelheiten
Thema 1
  • Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Thema 2
  • Objects, Functions, and Classes: Covers function, object, and class implementations to meet business requirements, along with the use of modules, decorators, variable scope, and execution flow.
Thema 3
  • Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Thema 4
  • Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Thema 5
  • Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
Thema 6
  • Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.

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Salesforce Certified JavaScript Developer - Multiple Choice JS-Dev-101 Prüfungsfragen mit Lösungen (Q104-Q109):

104. Frage
Value of:
true + 3 + '100' + null

Antwort: A

Begründung:
The correct answer is A.
JavaScript evaluates the expression from left to right:
true + 3 + '100' + null
Step 1:
true + 3
In numeric addition, true is converted to:
1
So:
true + 3
becomes:
1 + 3
Result:
4
Step 2:
4 + '100'
Because one operand is a string, JavaScript performs string concatenation instead of numeric addition.
So:
4 + '100'
becomes:
"4100"
Step 3:
"4100" + null
Again, because one operand is already a string, JavaScript converts null into the string:
"null"
So the final result is:
"4100null"
Execution summary:
true + 3 + '100' + null
// 1 + 3 + '100' + null
// 4 + '100' + null
// "4100" + null
// "4100null"
Therefore, the verified answer is A.


105. Frage
Given the code below:
01 function Person() {
02 this.firstName = 'John';
03 }
04
05 Person.proto = {
06 job: x => 'Developer'
07 });
08
09 const myFather = new Person();
10 const result = myFather.firstName + ' ' + myFather.job();
What is the value of result when line 10 executes?

Antwort: B

Begründung:
Person.proto is being set, but JavaScript uses Person.prototype for the prototype chain, not Person.proto.
Therefore, job is not on Person.prototype, and instances of Person do not have job via prototype.
myFather is created with new Person(), so:
myFather.firstName is 'John'.
myFather.job is undefined.
Attempting to call myFather.job() results in:
TypeError: myFather.job is not a function
So option A is correct.
________________________________________


106. Frage
There is a new requirement for a developer to implement a currPrice method that will return the current price of the item or sales..

What is the output when executing the code above

Antwort: D


107. Frage
A developer writes the code below to return a message to a user attempting to register a new username. If the username is available, a variable named msg is declared and assigned a value on line 03.
function getAvailabilityMessage(item) {
if (getAvailability(item)) {
var msg = "Username available";
return msg;
}
}

Antwort: C

Begründung:
The correct answer is C.
When getAvailability(item) returns true, the code inside the if block executes:
var msg = "Username available";
return msg;
The variable msg receives the string value:
"Username available"
Then that same value is returned from the function.
The key point is that var is function-scoped, not block-scoped. So msg belongs to the function scope of getAvailabilityMessage(). However, because the return msg; statement is inside the same if block, the function immediately returns the assigned string when the username is available.
Option A is incorrect because msg is defined before it is returned.
Option B is incorrect because "newUserName" is not assigned or returned anywhere in the function.
Option D would only happen if getAvailability(item) returned false, because then the function would finish without an explicit return value.
For the available username scenario, the verified answer is C.


108. Frage
Refer to the following code:
01 let obj = {
02 foo: 1,
03 bar: 2
04 }
05 let output = []
06
07 for (let something of obj) {
08 output.push(something);
09 }
10
11 console.log(output);
What is the value of output on line 11?

Antwort: D

Begründung:
The key line is:
for (let something of obj) {
In JavaScript:
for...of is used to iterate over iterable objects, such as:
Arrays
Strings
Maps
Sets
Other objects that implement a [Symbol.iterator] method.
Plain JavaScript objects created with object literal {} are not iterable by default. They do not have [Symbol.iterator], so using for...of directly on them causes a runtime error.
Specifically:
for (let something of obj) { ... }
will throw a TypeError similar to:
obj is not iterable
Therefore, the loop body never executes, and console.log(output); is never reached without an error.
Why other options are incorrect:
B . [1, 2]
To get [1, 2], you could use Object.values(obj) and iterate that array.
But here, for...of obj never yields values because it throws an error.
C . ["foo", "bar"]
To get property names, you could use Object.keys(obj) with for...of.
Again, the code does not do that; it incorrectly tries to iterate the object directly.
D . ["foo:1", "bar:2"]
You would need both keys and values, combining them manually.
The given code does not implement such logic and fails before pushing anything into output.
Hence, the correct answer is:
Answe r: A
Study Guide / Concept Reference (no links):
Difference between for...of and for...in
Iterables in JavaScript and [Symbol.iterator]
Plain objects {} are not iterable by default
Correct patterns to iterate object keys/values (Object.keys, Object.values, Object.entries)


109. Frage
......

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