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NEW QUESTION # 12
Given the code below:
Const copy = JSON.stringify((new String ('false') , new Bolean(false) undefined)); What is the value of copy?
Answer: C
NEW QUESTION # 13
Given two expressions var1 and var2, what are two valid ways to return the logical AND of the two expression and ensure it is data type Boolean? Choose 2 answers
Answer: B,D
NEW QUESTION # 14
Refer to the code below:
const event = new CustomEvent(
//Missing Code
);
obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about
recordId.
Which two options could a developer insert at the placeholder in line 02 to achieve this?
Choose 2 answers
Answer: A,C
Explanation:
}
}
NEW QUESTION # 15
Refer to HTML below:
<div id ="main">
<div id = " card-00">This card is smaller.</div>
<div id = "card-01">The width and height of this card is determined by its contents.</div>
</div>
Which expression outputs the screen width of the element with the ID card-01?
Answer: C
NEW QUESTION # 16
Given a value, which three options can a developer use to detect if the value is NaN?
Answer: B,C,E
Explanation:
In JavaScript, NaN has some special properties:
* NaN is not equal to anything, including itself.
* Equality operators (==, ===) do not work for detecting NaN.
Check each option:
* A. value === Number.NaN
* Number.NaN is just NaN.
* But NaN === NaN is always false.
* So this expression is never true and cannot be used to detect NaN.
* B. value == NaN
* Same issue. NaN == NaN is always false.
* So this also never detects NaN.
* C. Object.is(value, NaN)
* Object.is is a more precise equality comparison method.
* It treats NaN as equal to NaN: Object.is(NaN, NaN) is true.
* So Object.is(value, NaN) is a valid way to detect NaN.
* D. value !== value
* Because NaN is the only JavaScript value that is not equal to itself , value !== value is true only when value is NaN.
* This is a classic trick for NaN detection.
* E. Number.isNaN(value)
* Number.isNaN is the recommended modern way to check if a value is NaN without coercion .
* It returns true only if value is actually the number NaN.
Therefore, the three correct ways are:
* Object.is(value, NaN)
* value !== value
* Number.isNaN(value)
NEW QUESTION # 17
......
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