--- date: 20201126 id: 411125af-adb2-4f21-b3bb-99ffdf74a447 title: ephemeral --- # Origin Greek ephemeros "lasting only a day". # Definition The opposite of persistant. # Examples ## RAM - RAM is ephemeral whereas hard disk storage is persistant. ## Data structures Data structures are ephemeral because properties can be mutated and there's no way to get back the original object ``` javascript const dinner = { main: 'turkey', side: 'potatoes' } dinner.side = 'potatoes' console.log(dinner) // { main: 'turkey', side: 'potatoes' } ``` ## Cloud computing - AWS Lambda - Google Cloud Functions