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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q79-Q84):

NEW QUESTION # 79
Refer to the following code:

Which statement should be added to line 09 for the code to display 'The boat has a capacity of 10 people?

A. this.size = size;
B. super.size = size;
C. ship.size size;
D. super (size);

Answer: A

NEW QUESTION # 80
A developer has an ErrorHandler module that contains multiple functions.
What kind of export be leverages so that multiple functions can be used?

A. Named
B. Default
C. All
D. Multi

Answer: A

NEW QUESTION # 81
A developer creates an object where its properties should be immutable and prevent
properties from being added or modified.
Which method should be used to execute this business requirement ?

A. Object.const()
B. Object.eval()
C. Object.freeze()
D. Object.lock()

Answer: C

NEW QUESTION # 82
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:
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 # 83
A developer executes:
document.cookie;
document.cookie = ' key=John Smith ' ;
What is the behavior?

A. Cookies are not read because line 01 should be document.cookies, but the key value is set and all cookies are wiped.
B. Cookies are read and the key value is set, the remaining cookies are unaffected.
C. Cookies are read, but the key value is not set because the value is not URL encoded.
D. Cookies are read and the key value is set, and all cookies are wiped.

Answer: B

Explanation:
* document.cookie retrieves the cookie string.
* Setting document.cookie = ' key=John Smith ' adds or updates only that one cookie.
Important details:
* Writing to document.cookie does not overwrite all cookies .
* The browser does not require URL encoding , though it is recommended. Non-encoded spaces are allowed and automatically handled.
* document.cookies does not exist; the correct property is document.cookie.
Therefore, the correct behavior:
* Cookies are read.
* A new cookie key=John Smith is set.
* Existing cookies remain.
JavaScript Knowledge References (text-only)
* Writing document.cookie appends or updates cookies, not replaces them.
* document.cookie is both getter and setter for cookie strings.

NEW QUESTION # 84
......

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