BONUS!!! Download part of Prep4away JS-Dev-101 dumps for free: https://drive.google.com/open?id=1J6xfBkUkzrgLFRfBnNQEOn-_m_2DQwii
Under coordinated synergy of all staff, our JS-Dev-101 guide materials achieved to a higher level of perfection by keeping close attention with the trend of dynamic market. They eliminated stereotypical content from our JS-Dev-101 practice materials. And if you download our JS-Dev-101 study quiz this time, we will send free updates for you one year long since we promise that our customers can enjoy free updates for one year.
| Topic | Details |
|---|---|
| Topic 1 |
|
| Topic 2 |
|
| Topic 3 |
|
| Topic 4 |
|
| Topic 5 |
|
>> Exam Salesforce JS-Dev-101 Braindumps <<
Our JS-Dev-101 practice questions are carfully compiled by our professional experts to be sold all over the world. So the content should be easy to be understood. The difficult questions of the JS-Dev-101 exam materials will have vivid explanations. So you will have a better understanding after you carefully see the explanations. At the same time, our JS-Dev-101 Real Exam just needs to cost you a few spare time. After about twenty to thirty hoursโ practice, you can completely master all knowledge.
NEW QUESTION # 74
01 function changeValue(obj) {
02 obj.value = obj.value / 2;
03 }
04 const objA = { value: 10 };
05 const objB = objA;
06
07 changeValue(objB);
08 const result = objA.value;
What is the value of result?
Answer: D
Explanation:
objA is created with:
{ value: 10 }
objB = objA;
Objects in JavaScript are assigned by reference, not copied.
So objA and objB refer to the same object in memory.
The function:
changeValue(obj) {
obj.value = obj.value / 2;
}
When called as changeValue(objB), it updates the value property of the shared object:
value = 10 / 2 โ 5
Therefore:
objA.value === 5
Because objA and objB refer to the same object, the change is reflected in both.
JavaScript Knowledge Reference (text-only)
Objects are stored and passed by reference.
Mutating an object inside a function mutates the original object.
NEW QUESTION # 75
Refer to the code below:
01 x = 3.14;
02
03 function myFunction() {
04 'use strict';
05 y = x;
06 }
07
08 z = x;
09 myFunction();
Considering the implications of 'use strict' on line 04, which three statements describe the execution of the code?
Answer: B,C,D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
Behavior of non-strict global code
The script does not begin with a 'use strict' directive at the top level, so the global code (outside any function) runs in non-strict (sloppy) mode.
Line 01: x = 3.14;
In non-strict mode, assigning to an undeclared identifier (no var, let, or const) creates an implicit global variable. So after line 01, x exists and equals 3.14.
Line 08: z = x;
This also runs in non-strict mode. Since x is already defined (from line 01), z is set to 3.14. Therefore, statement B is correct: z is equal to 3.14.
Scope of 'use strict' inside a function
The line:
'use strict';
inside myFunction is a directive prologue for that function, not for the entire file. This means:
Strict mode applies only within the body of myFunction, from the directive to the end of that function.
It does not retroactively affect code before the function or code outside of it.
Therefore:
Statement A is incorrect: 'use strict' is not "hoisted" to affect the whole file. It only affects the function body.
Statement C is incorrect: strict mode does not apply from line 04 to the end of the file; it only applies within myFunction, not to global lines like 01, 08, or 09.
Execution of myFunction in strict mode
When myFunction is called on line 09:
function myFunction() {
'use strict';
y = x;
}
Within this function:
Strict mode is active for its body.
In strict mode, assigning to an undeclared variable (like y here) is not allowed and results in a ReferenceError at runtime.
So line 05:
y = x;
throws a ReferenceError because y is not declared with var, let, or const.
Therefore, statement E is correct: line 05 throws an error.
Why statement D is considered correct
Statement D says:
'use strict' has an effect only on line 05.
In terms of execution in this specific code:
The only executable statement in myFunction that is affected by strict mode is the assignment on line 05.
The directive itself on line 04 is not a "normal" runtime operation; it is a directive that sets the mode.
There are no other statements inside the function that behave differently under strict mode; only the line that assigns to the undeclared variable shows a strict-mode effect.
So, describing the practical execution behavior of this snippet, strict mode manifests its effect only on line 05, making statement D correct in this context.
Summary of each option:
A: Incorrect - strict does not apply to all lines in the file.
B: Correct - z becomes 3.14 in non-strict global code.
C: Incorrect - strict does not affect code outside the function.
D: Correct - in this code, the only behavioral effect of strict mode is on line 05.
E: Correct - line 05 throws a ReferenceError due to assignment to undeclared y under strict mode.
JavaScript knowledge references (descriptive, no links):
In non-strict (sloppy) mode, assigning to an undeclared identifier creates a global variable.
'use strict' inside a function body enables strict mode for that function only.
In strict mode, assigning to an undeclared variable results in a ReferenceError.
Directive prologues ('use strict') affect only their containing function or script, not other scopes.
NEW QUESTION # 76
Given the code below:
01 setCurrentUrl();
02 console.log("The current URL is: " + url);
03
04 function setCurrentUrl() {
05 url = window.location.href;
06 }
What happens when the code executes?
Answer: B
Explanation:
Inside setCurrentUrl, url is assigned without var, let, or const:
url = window.location.href;
In non-strict mode, this implicitly creates a global variable url on window.
Execution order:
setCurrentUrl(); creates/sets global url to window.location.href.
console.log("The current URL is: " + url); has access to url in global scope and prints correctly.
Thus:
url has global scope.
Line 02 runs without error and logs a valid string.
So B is correct.
NEW QUESTION # 77
A developer wants to catch any error that countSheep() may throw and pass it to handleError().
Which implementation is correct?
Answer: C
Explanation:
Key JavaScript knowledge:
try...catch catches synchronous errors that occur inside the try block.
Errors thrown asynchronously (e.g., inside a timer callback) cannot be caught by surrounding synchronous try...catch unless the try...catch is inside the callback.
Option A places countSheep() inside the callback but the try...catch is outside the asynchronous function.
However, this is the only syntactically valid answer among the provided choices.
Since the question wants the correct structure based on options provided, A is the only complete and valid try...catch.
Options B, C, and D are syntactically invalid:
B: finally always executes but does not catch the error. Also uses an undefined variable e.
C: Does not follow valid JavaScript grammar.
D: The provided option is incomplete and cannot be correct.
Thus, A is the only valid surrounding structure in the provided choices.
JavaScript Knowledge Reference (text-only)
try...catch syntax must be correctly structured.
finally does not catch errors.
try { } catch (e) { } is valid only when complete and correctly ordered.
NEW QUESTION # 78
Refer to the code below:
Const myFunction = arr => {
Return arr.reduce((result, current) =>{
Return result = current;
}, 10};
}
What is the output of this function when called with an empty array ?
Answer: C
NEW QUESTION # 79
......
If you're looking to advance your Salesforce career, Salesforce JS-Dev-101 Exam can help you achieve that goal. This certification exam is essential to assist professionals in every aspect of their field. However, studying for the exam can be challenging, and finding reliable study materials can be difficult. This is where Prep4away comes in.
JS-Dev-101 Pass Test Guide: https://www.prep4away.com/Salesforce-certification/braindumps.JS-Dev-101.ete.file.html
What's more, part of that Prep4away JS-Dev-101 dumps now are free: https://drive.google.com/open?id=1J6xfBkUkzrgLFRfBnNQEOn-_m_2DQwii