JavaScript Types

typeOf.js

function typeOf(input) {
  return Object
          .prototype
          .toString
          .call(input)
          .replace(/\[object (\w+)\]/, '$1')
          .toLowerCase();
}

// boolean
console.log(typeOf(true));
// number
console.log(typeOf(42));
// string
console.log(typeOf('Jhon Snow'));
// array
console.log(typeOf([1, 2, 3]));
// object
console.log(typeOf({foo: 42, bar: 'xyz'}));
// function
console.log(typeOf(function() {}));