SayHello.js

/*
Say hello!

Write a function to greet a person. Function will take name as input and greet the person by saying hello. Return null/nil/None if input is empty string or null/nil/None.

Example:

greet("Niks") === "hello Niks!";
greet("") === null; // Return null if input is empty string
greet(null) === null; // Return null if input is null
*/
function greet(name) {

    if (name==''||name==null||name=='nil'||name=='None')
      return null;
    else
      return(`hello ${name}!`);
  }