JavaScript Variable
.variable name will not be start with digit(23466).
.Variable name in not allow blank space when you define a variable.
.keyword name not allow for define as a variable name.
.Variable case-sensitive.
.But variables name can start underscores, dollar($).
.variable names only contain letters, numbers, underscores, or dollar signs.
A-Z, a-z, 0-9, _, $
.variable names must begin with a letter, an underscores, or dollar sign.
.variable names cannot contain spaces.
.Reserved words like javascript keywords cannot be used as variables names.
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