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NEW QUESTION # 110
Given the following code:
let x = ( ' 15 ' + 10) * 2;
What is the value of x?
Answer: A
Explanation:
Comprehensive and Detailed Explanation:
Evaluate step by step:
* ' 15 ' + 10
* + with a string operand performs string concatenation.
* 10 is coerced to ' 10 ' .
* Result: ' 1510 ' .
* ' 1510 ' * 2
* * always performs numeric multiplication.
* ' 1510 ' is converted to the number 1510.
* 1510 * 2 = 3020.
So x is 3020.
NEW QUESTION # 111
Which statement allows a developer to update the browser navigation history without a page refresh?
Answer: D
Explanation:
The correct answer is C .
The browser provides the History API through:
window.history
To add a new entry to the browser's session history without refreshing the page, JavaScript uses:
window.history.pushState(state, title, url);
So the valid statement is:
window.history.pushState(newStateObject, ' ' , null);
This updates the browser history stack without forcing a full page reload. It is commonly used in single-page applications when changing views or routes dynamically.
The method accepts three arguments:
window.history.pushState(stateObject, title, url);
stateObject stores custom data associated with the history entry.
title is usually passed as an empty string because many browsers ignore it.
url optionally changes the displayed URL. Passing null means no new URL is provided.
Option A is incorrect because:
window.customHistory
is not the standard browser History API object.
Option B is incorrect because:
createState()
is not a valid History API method.
Option D is incorrect because:
updateState()
is not a valid History API method.
The correct browser API method is:
window.history.pushState()
Therefore, the verified answer is C .
NEW QUESTION # 112
A developer implements a function that adds a few values.
function sum(num1, num2, num3) {
if (num3 === undefined) {
num3 = 0;
}
return num1 + num2 + num3;
}
Which three options can the developer invoke for this function to get a return value of 10?
Answer: B,C,D
Explanation:
The verified corrected answers are C, D, and E .
This function is a normal function, not a curried function:
function sum(num1, num2, num3) {
if (num3 === undefined) {
num3 = 0;
}
return num1 + num2 + num3;
}
It expects values to be passed in the same function call:
sum(num1, num2, num3);
Now check the valid corrected options.
Option C:
sum(5, 5, 0);
Calculation:
5 + 5 + 0
Result:
10
So C is correct .
Option D:
sum(10, 0);
Here, num3 is not provided, so it is undefined.
The function checks:
if (num3 === undefined) {
num3 = 0;
}
So the calculation becomes:
10 + 0 + 0
Result:
10
So D is correct .
Option E:
sum(5, 2, 3);
Calculation:
5 + 2 + 3
Result:
10
So E is correct .
Why A and B are incorrect as originally written:
sum(5)(5);
This calls sum(5) first. Since num2 is missing, the result becomes NaN. Then JavaScript tries to call that returned value as a function, which causes a TypeError.
sum()(10);
This also calls sum() first, producing NaN, and then attempts to call NaN as a function.
Those styles would only work if sum were written as a curried function, but the given implementation is not curried.
Therefore, the verified corrected answers are C, D, and E .
NEW QUESTION # 113
Refer to code below:
Let productSKU = '8675309' ;
A developer has a requirement to generate SKU numbers that are always 19 characters lon, starting with 'sku', and padded with zeros.
Which statement assigns the values sku0000000008675309 ?
Answer: B
NEW QUESTION # 114
Given a value, which two options can a developer use to detect if the value is NaN?
Answer: A,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 # 115
......
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