JS console lesson : detect datatype

getType.js

function getType(value)
{
var dtypes = [Function, RegExp, Number, String, Boolean, Object], x, len;
    
if (typeof value === "object" || typeof value === "function") {
  
     for (x = 0, len = dtypes.length; x < len; x++) 
     {
            if (value instanceof dtypes[x])
            {
                return dtypes[x];
            }
      }
    }
    
    return typeof value;
}

console.log(getType(12)); // Number
console.log(getType('w3c')); //String
console.log(getType(false)); // Boolean