.NET Core 2.0 By Example

Purity

In functional programming, a function is referred to as a pure function if all its input arguments are known and all its output results are also well known and declared; or we can say the input and output result has no side-effects. Now, you must be curious to know what the side-effect could be, let's discuss it.

Let's look at the following example:

Public int sum(int x){return x+x; }

In the previous example, the function sum takes an integer input and returns an integer value and predefined result. This kind of function is referred to as a pure function. Let's investigate the following example:

Public void verifyData(){  Employee emp = OrgQueue.getEmp();  If(emp != null)  {    ProcessForm(emp);  }}

In the preceding example, the verifyData() ...