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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	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 2	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 3	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
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	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q131-Q136):

NEW QUESTION # 131
Which three browser specific APIs are available for developers to persist data between page loads ?
Choose 3 answers

A. Cookies
B. localStorage.
C. IIFEs
D. indexedDB
E. Global variables

Answer: B,C,D

NEW QUESTION # 132
Refer of the string below:
Const str = 'sa;esforce'=;
Which two statement result in the word 'Sale'?
Choose 2 answers

A. str, substring(1,5) ;
B. str, substring(0,5) ;
C. str, substr(1,5) ;
D. str, substr(0,5) ;

Answer: B,D

NEW QUESTION # 133
developer publishes a new version of a package with new features that do not break backward compatibility. The previous version number was 1.1.3.
Following semantic versioning format, what should the new package version number be?

A. 1.2.3
B. 1.1.4
C. 1.2.0
D. 2.0.0

Answer: D

NEW QUESTION # 134
Which two console logs output NaN?

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

Answer: A,B

Explanation:
Comprehensive and Detailed Explanation From JavaScript Knowledge:
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 # 135
Refer to the code below
let inArray = [[1,2],[3,4,5]];
which two statements results in the array [1,2,3,4,5]?
choose 2 answer

A. [ ].concat(...inArray);
B. [ ].concat([...inArray])
C. [ ].concat.apply(inArray,[ ]);
D. [ ].concat.apply([ ],inArray);

Answer: A,D

NEW QUESTION # 136
......

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