typeof
Node module. typeOf('a string') == 'string', typeOf([]) == 'array', etc.. Also supports named functions detections aka javascript classes
isobject
Returns true if the value is an object and not an array or null.
is-plain-object
Returns true if an object was created by the `Object` constructor, or Object.create(null).
kind-of
Get the native type of a value.
is-number
Returns true if a number or string value is a finite number. Useful for regex matches, parsing, user input, etc.
