function truthy(val){

  switch(typeof val){

    case "number":

      // since the val is already a number, only zero and NaN should be counted as falsy.

      return val !== 0 && !Number.isNaN(Number(val));

    case "string":

      // val is string, so need to check if its empty or "0". Otherwise it should be counted as truthy

      return val !== "" && val !== "0";

    case "boolean":

      // val is already boolean so only boolean check would suffice

      return val === true;

    case "symbol":

      //    symbol should be truthy

      return true;

    case "object":

      // object can be deceiving, so lets check for NULL and empty object

      if( val === null ){

        return false;

      }

      else{

        for( var i in val ){

          if( val.hasOwnProperty(i) ){

            return true;

          }

        }

      }

      return false;

​

    case "undefiend":

      return false;

    case "function":

      return true;

  }

}

function falsy(val){

  return !truthy(val);

}

​

console.log(truthy(1));     // should be true

console.log(truthy(0));     // should be false

console.log(truthy(NaN));   // should be false

console.log(truthy(""));    // should be false

console.log(truthy("0"));   // should be false

console.log(truthy("1"));   // should be true

console.log(truthy("meh")); // should be true

console.log(truthy({}));    // should be false

console.log(truthy(null));  // should be false

console.log(truthy(false)); // should be false