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NEW QUESTION # 68
Which statement allows a developer to update the browser navigation history without a page refresh?
Answer: A
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 # 69
A developer has an irresponsible module that contains multiple functions.
What kind of export should be leveraged so that multiple functions can be used?
Answer: B
NEW QUESTION # 70
Refer to the code below:
Const searchTest = 'Yay! Salesforce is amazing!" ;
Let result1 = searchText.search(/sales/i);
Let result 21 = searchText.search(/sales/i);
console.log(result1);
console.log(result2);
After running this code, which result is displayed on the console?
Answer: A
NEW QUESTION # 71
A developer has a fizzbuzz function that, when passed in a number, returns the following:
'fizz' if the number is divisible by 3.
'buzz' if the number is divisible by 5.
'fizzbuzz' if the number is divisible by both 3 and 5.
Empty string if the number is divisible by neither 3 nor 5.
Which two test cases properly test scenarios for the fizzbuzz function?
Answer: A,D
Explanation:
The correct answers are B and D.
A strong test case checks whether the actual output matches the expected behavior of the function.
For Option B:
let res = fizzbuzz(15);
console.assert(res === 'fizzbuzz');
The number 15 is divisible by both 3 and 5:
15 % 3 === 0
15 % 5 === 0
So the correct return value is:
'fizzbuzz'
That makes option B a valid test.
For Option D:
let res = fizzbuzz(Infinity);
console.assert(res === '');
Infinity is not a normal finite divisible number. In JavaScript:
Infinity % 3
Infinity % 5
produce NaN, and comparisons such as:
Infinity % 3 === 0
are false.
So a typical fizzbuzz implementation would not treat Infinity as divisible by 3 or 5, meaning it should return:
''
That makes option D a valid test for the "neither divisible by 3 nor 5" path.
Now compare the incorrect options:
Option A is wrong because:
fizzbuzz(3)
should return:
'fizz'
not:
'buzz'
Option C is wrong because the function specification says the function returns strings such as 'fizz', 'buzz', 'fizzbuzz', or ''. It does not say the function returns numeric NaN.
So this assertion is not appropriate:
console.assert(isNaN(res));
Therefore, the verified answers are B and D.
NEW QUESTION # 72
Refer to the code declarations below:
Which three expressions return the string JavaScript?
Choose 3 answers
Answer: B,C,E
NEW QUESTION # 73
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