Answer & Solution
Answer: Option A
Solution:
The typeof operator returns 'undefined' for variables that are not initialized.
Q
What is the result of typeof undefined?
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What is the result of typeof document.getElementById('example')?
A). element
B). object
C). function
D). undefined
What is the result of typeof 'hello'?
A). string
B). object
C). undefined
D). number
What does typeof new RangeError('range error') return?
A). rangeerror
B). object
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What does typeof console return in a web browser environment?
A). console
B). object
C). function
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What does typeof document return in a web browser environment?
A). document
B). object
C). function
D). undefined
What does typeof function() {} return?
A). function
B). object
C). method
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What is the result of typeof null?
A). null
B). undefined
C). object
D). number
What does typeof new Float32Array() return?
A). float32array
B). array
C). object
D). undefined
What is the result of typeof new SyntaxError('syntax error')?
A). syntaxerror
B). object
C). function
D). undefined
What does typeof true return?
A). number
B). boolean
C). undefined
D). object