Haskell: Define custom operators

An operator is a symbol which perform an operation between operands

An operator is said to be unary, if it performs operation on single operand.

An operator is said to be binary, if it performs operation on two operands

An Operator is said to be ternary if it perform operation on three operands. In Haskell, any function that takes two arguments and has a name consist entirely of non-alphanumeric characters is considered an operator.

*Main> let (&) a b = 3 * (a+b) 
*Main> 
*Main> 10 & 20
90
*Main> 
*Main> 2 & 3
15

You can also use operators in prefix notation.

*Main> (&) 2 3
15
*Main> 
*Main> (&) 20 20
120
*Main> 
*Main> (&) 10 20
90

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