Exam 70-480 topic 4 question 19 discussion

Actual exam question from Microsoft's 70-480

Question #: 19
Topic #: 4

HOTSPOT -
You are validating user input by using built-in JavaScript functions.
The application must:
✑ Store the value that is entered in a variable named inputValue
✑ Use the built-in isNaN(tnputValue) function to evaluate the data type
You need to validate the return value of the isNaN(inputValue) function.
Which values will be returned? (To answer, configure the appropriate options in the dialog box in the answer area.)
Hot Area:

Show Suggested Answer

Suggested Answer:

isNan is false for all these inputs.
The isNaN() function determines whether a value is an illegal number (Not-a-Number).
This function returns true if the value is NaN, and false if not.
Reference: JavaScript parseInt() Function; JavaScript isNaN() Function

by MrEngineer at Nov. 27, 2019, 12:41 p.m.

Comments

Submit Cancel

piroman

Highly Voted 5 years, 6 months ago

False False False False

upvoted 10 times

nelaed

4 years, 11 months ago

Yes 4xFalse - i ha var userInput = -13; if (isNaN(userInput)) alert("true"); else alert("false"); userInput = 23.3; if (isNaN(userInput)) alert("true"); else alert("false"); userInput = 3*8; if (isNaN(userInput)) alert("true"); else alert("false"); userInput = '5'; if (isNaN(userInput)) alert("true"); else alert("false");ve tested it;

upvoted 1 times

...