100% Pass Quiz Salesforce - JS-Dev-101 - Salesforce Certified JavaScript Developer - Multiple Choice–Reliable Latest Exam Review

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Salesforce JS-Dev-101 Exam Overview:

Certification Vendor:	Salesforce
Exam Name:	Salesforce Certified JavaScript Developer - Multiple Choice
Exam Number:	JS-Dev-101
Certificate Validity Period:	Does not expire; requires maintenance updates
Exam Price:	USD 200
Exam Format:	Multiple choice, Multiple select
Available Languages:	Japanese, English
Passing Score:	65%
Real Exam Qty:	60 scored + up to 5 unscored
Related Certifications:	Salesforce Certified Developer Salesforce Certified Platform Developer I
Exam Duration:	105 minutes
Recommended Training:	Trailhead JavaScript Developer I Certification Prep
Exam Registration:	Salesforce Certification Registration
Sample Questions:	Salesforce JS-Dev-101 Sample Questions
Exam Way:	Online proctored or onsite at authorized testing centers
Pre Condition:	No formal prerequisites; recommended: strong JavaScript fundamentals, ES6+ experience, web development familiarity
Official Syllabus URL:	https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101

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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 2	Variables, Types, and Collections: Covers declaring and initializing variables, working with strings, numbers, dates, arrays, and JSON, along with understanding type coercion and truthy falsy evaluations.
Topic 3	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 4	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.
Topic 5	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
Topic 6	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.

Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q120-Q125):

NEW QUESTION # 120
developer wants to use a module named universalContainersLib and them callfunctions from it.
How should a developer import every function from the module and then call the functions foo and bar ?

A. import all from '/path/universalContaineraLib.js';universalContainersLib.foo();universalContainersLib.bar();
B. import (foo, bar) from '/path/universalContainersLib.js';foo();bar();
C. import * ad lib from '/path/universalContainersLib.js';lib.foo();lib.bar();
D. import * from '/path/universalContaineraLib.js';universalContainersLib.foo();universalContainersLib.bar();

Answer: C

NEW QUESTION # 121
Given a value, which two options can a developer use to detect if the value is NaN?

A. value === Number.NaN
B. isNaN(value)
C. value == NaN
D. Object.is(value, NaN)

Answer: B,D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
We already know NaN is special: it is not equal to itself.
Check each:
A . value === Number.NaN
Number.NaN is NaN.
NaN === NaN is always false.
This will never be true; cannot reliably detect NaN.
B . value == NaN
NaN == NaN is also always false.
Again, this never detects NaN.
C . isNaN(value)
Global isNaN converts its argument to a number and then checks if the result is NaN.
This can detect NaN, but it may also return true for non-number values that coerce to NaN, such as isNaN('foo').
Regardless, it is a standard way to detect if a value is "NaN-like" in JavaScript.
D . Object.is(value, NaN)
Object.is(NaN, NaN) returns true.
This is a strict way to detect a value that is exactly NaN (no coercion).
Therefore, among the given choices, the two viable ways to detect NaN are:
isNaN(value)
Object.is(value, NaN)
________________________________________

NEW QUESTION # 122
Refer to the code snippet below:
Let array = [1, 2, 3, 4, 4, 5, 4, 4];
For (let i =0; i <array.length; i++){
if (array[i] === 4) {
array.splice(i, 1);
}
}
What is the value of the array after the code executes?

A. [1, 2, 3, 5]
B. [1, 2, 3, 4, 4, 5, 4]
C. [1, 2, 3, 4, 5, 4, 4]
D. [1, 2, 3, 4, 5, 4]

Answer: D

NEW QUESTION # 123
Which statement parses successfully?

A. JSON.parse ("foo");
B. JSON.parse ("foo");
C. JSON.parse (""foo'");
D. JSON. parse (""foo"');

Answer: D

NEW QUESTION # 124
developer uses the code below to format a date.

After executing, what is the value offormattedDate?

A. May 10, 2020
B. October 05, 2020
C. November 05, 2020
D. June 10, 2020

Answer: D

NEW QUESTION # 125
......

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