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Which of the following are valid function names 1 function() 2...

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Functions
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Which of the following are valid function names? 1. function() 2. €() 3. .function() 4. $function()

Answer & Solution
Correct Answer: Option A
Except a) others are invalid names. According to the specified regular expression ([a-zA-Z_x7f-xff][a-zA-Z0-9_x7f-xff]*), a function name like this one is valid.
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