Exam JavaScript-Developer-I Cram Questions - JavaScript-Developer-I Reliable Test Labs

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Browsers and Events	17%	- Event handling, propagation, and delegation - Script loading and execution order - Browser APIs and Web Storage - Document Object Model (DOM) manipulation - Window and document object properties
Topic 2: Variables, Types, and Collections	23%	- Working with strings, numbers, dates, and booleans - Variable declaration and initialization - JSON parsing and usage - Type coercion and conversion rules - Array methods and data manipulation - Truthy and falsy values
Topic 3: Objects, Functions, and Classes	25%	- Class syntax, inheritance, and prototypes - Closures and execution context - Object creation, properties, and methods - Decorators and advanced function patterns - Modules and imports/exports - Function definitions, parameters, and scope
Topic 4: Testing	7%	- Testing frameworks and assertions - Code coverage and best practices - Unit testing concepts - Test doubles and mocks
Topic 5: Asynchronous Programming	13%	- Async/await syntax - Event loop and micro/macro tasks - Callbacks and callback hell - Promises and chaining - Fetch API and HTTP requests
Topic 6: Debugging and Error Handling	7%	- Debugging tools and breakpoints - Console methods and logging - Defensive programming practices - Error types and exception handling
Topic 7: Server-Side JavaScript	8%	- Module system and require/import - Command-line tools and scripts - Node.js fundamentals and runtime - Core Node.js modules

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q71-Q76):

NEW QUESTION # 71
A developer has the following array of hourly wages:
Let arr = (8, 5, 9, 75, 11, 25, 7, 75, , 13, 25);
For workers making less than $10 an hour rate should be multiple by 1.25 and returned in a new array.
How should the developer implement the request?

A. let arrl = arr-map((num) => { return ran * 1.25 }).filter((val) -> { return val < 10));
B. let arrl = arr.filterBy((val) => val < 10 ).aapBy<(num) -> num = ..25 );
C. let arrl = arr .rr.acArray ((val) => ( val < 10 )) ,map((num) => { num * 1.25 ));
D. let arrl = arr.filter((val) => val < 10).map((num) -> num = 1.25);

Answer: A

NEW QUESTION # 72
Which two console logs output NaN?

A. console.log(10 / ' five ' );
B. console.log(10 / Number( ' 5 ' ));
C. console.log(parseInt( ' two ' ));
D. console.log(10 / 0);

Answer: A,C

Explanation:
Recall:
* NaN stands for "Not-a-Number".
* Arithmetic involving non-numeric values that cannot be converted to numbers often results in NaN.
Check each:
* A. 10 / 0
* In JavaScript, dividing a positive number by 0 results in Infinity, not NaN.
* So this logs Infinity.
* B. parseInt( ' two ' )
* parseInt tries to parse a numeric prefix from the string.
* ' two ' does not start with numeric digits, so parseInt( ' two ' ) returns NaN.
* The console log prints NaN.
* C. 10 / Number( ' 5 ' )
* Number( ' 5 ' ) # 5.
* 10 / 5 # 2.
* Logs 2, not NaN.
* D. 10 / ' five '
* ' five ' is coerced to a number using Number( ' five ' ), which is NaN.
* 10 / NaN # NaN.
* Logs NaN.
So the console logs that output NaN are from B and D.
Relevant concepts: NaN, Infinity, parseInt, Number() coercion, arithmetic with invalid numeric values.

NEW QUESTION # 73
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array.

Which two results occur when running this test on the updated sum3 function?
Choose 2 answers

A. The line 05 assertion passes.
B. The line 02 assertion passes.
C. The line 02 assertion fails.
D. The line 05 assertion fails.

Answer: B,D

NEW QUESTION # 74
Refer to the code below:
What is the output after the code executes?

A. undefined
B. Developer
C. ReferenceError: eyeColor is not defined
D. ReferenceError: assignment to undeclared variable ''Person''

Answer: A

NEW QUESTION # 75
Refer to the following code:

What will the console when the button is clicked?

A. Outer message
B. Outer message
C. Inner message
D. Inner message

Answer: B

NEW QUESTION # 76
......

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