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Declaring Variable and Re-declaring Variables in JavaScript

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Declaring Variable Rule

Variable can contain a combination of letters, digits, underscores ( _ ), and
dollar signs ( $ ).
Must begin with a letter A-Z or a-z or underscore or dollar sign
A variable name cannot start with a number
Must not contain any space characters
JavaScript is case-sensitive
Can‟t use reserved keywords

A variable declared without a value will have the value undefined