Determines whether an object has a property with the specified name. Avoid calling prototype builtin hasOwnProperty for two reasons:

1. hasOwnProperty is defined on the object as something else:

   const options = { ending: 'utf8', hasOwnProperty: 'foo' }; options.hasOwnProperty('ending') // throws a TypeError

2. The object doesn't inherit from Object.prototype:

   const options = Object.create(null); options.ending = 'utf8'; options.hasOwnProperty('ending'); // throws a TypeError