03-Throw.js

//Objective
//In this challenge, we practice using throw and catch statements to work with custom error messages.
//Task
//Complete the isPositive function below. It has one integer parameter, a. If the value of a is positive, it must return the string YES. Otherwise, it must throw an Error according to the following rules:
//If a is 0, throw an Error with message = Zero Error.
//If a is negative, throw an Error with message = Negative Error.

function isPositive(a) {
  if (typeof a === "number" && a > 0) {
    return "YES";
  } else if (a === 0) {
    throw new Error("Zero Error");
  } else if (a < 0) {
    throw new Error("Negative Error");
  } else {
    throw new Error("Invalid input Error");
  }
}