utilities.js

function validateArray(inputArray){
    if (typeof (inputObject) === "number") {
  
        // check if Number is not a NaN
        if (isNaN(inputObject)) {
          throw new Error("Input is NaN.")
        }
  
        // check for negative values
        if (inputObject < 0) {
          throw new Error("Input cannot be negative")
        }
  
        // check for integral values only
        if ((inputObject % 1) != 0) {
          throw new Error("Input needs to be an integral value.")
        }
  
        while (inputObject != 0) {
          this._internalArray.unshift(inputObject % 10)
          inputObject = Math.floor(inputObject / 10)
        }
      } else if (typeof (inputObject) === "string") {
  
        // check if length is not zero
        if (inputObject.length == 0) {
          throw new Error("Empty string is not accepted.")
        }
        
        // check if every character is a decimal digit
        let myRegex = /^[0-9]+$/
        if (!myRegex.test(inputObject)) {
          throw new Error("String can have decimal numbers only.")
        }
        
        for (let index = 0; index < inputObject.length; index++) {
          const currentDigit = parseInt(inputObject.charAt(index))
          this._internalArray.push(currentDigit)
        }
  
      }
  
       else if (Array.isArray(inputObject)) {  // IS THIS HOW ITS DONE?
        console.log("You sent an Array")
  
        // TODO validate the individual elements of the inputArray and initialize
        // the _internalArray
  
  
        // initialize the member array
        this._internalArray = inputObject
  
      } else if (typeof inputObject === "object") {  // IS THIS HOW ITS DONE?
        console.log("You sent an Object")
  
        // TODO check if this object has getInternalArray() and make a deep copy
        // and assign it to local _internalArray
  
        // initialize the member array
        this._internalArray = [4, 5, 6]
  
      } else {        
        console.log("You sent some bullshit!")
  
        throw new Error(`Constuctor of IniniteNumber does not support this data`
          + ` type ${typeof inputObject}`)
      }
}

module.exports = {validateArray}