Wallace Gucht

A Car Loan EMI is the Equated Monthly Instalments that the borrower is liable to pay on a stipulated date every month during the entire tenure of the loan. The calculation is the summation of the principal amount and the interest amount repayable by the borrower to the lender.

When the generic null is applied to another value, it is the Identity function.

Indexing with the generic null has the same effect.

Return a value unchanged

Where x is any value, returns x.

Applying multiple functions to the same data, with one of the operations as “do nothing”.

Identity can also be achieved via indexing.

and used in variants thereof for e.g. amends

When prefix notation is used, x does not have to be an applicable value.

Q does not have a dedicated null type. Instead :: is used to denote a generic null value. For example, functions that ‘return no value’, actually return ::.

When a unary function is called with no arguments, :: is passed in.

Since :: has a type for which no vector variant exists, it is useful to prevent a mixed list from being coerced into a vector when all items happen to be of the same type. (This is important when you need to preserve the ability to add non-conforming items later.)

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