Unary operator typeof returns what if the operand value is null
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The “unary operator” type of returns the object if the operand value is Null. EXPLANATION: In the expression a+b=c, a and b are operators, + and = are operators and c is the result.
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Regular Expressions
Regular Expressions are used to denote regular languages. An expression is regular if:
ɸ is a regular expression for regular language ɸ.
ɛ is a regular expression for regular language {ɛ}.
If a ∈ Σ (Σ represents the input alphabet), a is regular expression with language {a}.
If a and b are regular expression, a + b is also a regular expression with language {a,b}.
If a and b are regular expression, ab (concatenation of a and b) is also regular.
If a is regular expression, a* (0 or more times a) is also regular.
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