Valid or invalid variable name?
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sizeOfCircle
Valid variable name (uses camelcase)
circle size
Invalid variable name: Cannot include space
1count
Invalid variable name: Cannot start with a number
$cost
Invalid variable name: Must begin with a letter (usually lowercase)
count
Valid variable name
triangle-size
Valid variable name (dash is ok)
triangle_size
Valid variable name (underscore is ok)
homeAddress2
Valid variable name (uses camelcase and digits)
