Would you like to clone this notebook?
When you clone a notebook you are able to make changes without affecting the original notebook.
const features = {}
console.log(`undefined ${!features.foo ? 'block' : 'none'}`)
features.foo = false
console.log(`false ${!features.foo ? 'block' : 'none'}`)
features.foo = ""
console.log(`empty ${!features.foo ? 'block' : 'none'}`)
features.foo = true
console.log(`true ${!features.foo ? 'block' : 'none'}`)
features.foo = {}
console.log(`defined ${!features.foo ? 'block' : 'none'}`)
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