Exam 70-480 topic 2 question 8 discussion

Actual exam question from Microsoft's 70-480

Question #: 8
Topic #: 2

You are testing the value of the following variable in JavaScript. var height = "300";
A block of code must execute if the following conditions are true:
✑ The height variable is set to 300
✑ The height variable is of type string
You need to implement the code to run the test.
Which line of code should you use?

A. if (height = = 300)
B. if (height = = "300")
C. if (height ! "300")
D. if (height ! = 300)

Show Suggested Answer

Suggested Answer: B 🗳️
Use = = to test for equality.
Use "300" to test for the string.

by Piggas at Aug. 5, 2019, 8:23 p.m.

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Piggas

Highly Voted 5 years, 9 months ago

Answer A and B is the same. If B is correct answer, then B should be written as "if (height === "300") with the 3 equal sign operators to test for type and value

upvoted 15 times

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JMz123

Highly Voted 5 years, 6 months ago

Since A and B do not do type checking, or rather coerce types, they are the same answer, as Piggas pointed out. And yest to get both conditions it needs to be if (height === "300")

upvoted 5 times

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alezvic2

Most Recent 4 years, 4 months ago

As other pointed out, it'd be correct to use height === "300" to check for type. Both height == 300 and == "300" return true but in neither case we can confirm the type of height.

upvoted 2 times

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NellyM

4 years, 6 months ago

A is not of string type.B is correct

upvoted 1 times

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JMz123

5 years, 6 months ago

spaces in the middle of an operator FAIL

upvoted 3 times

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Exam 70-480 topic 2 question 8 discussion

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Piggas

JMz123

alezvic2

NellyM

JMz123

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